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7252021 = 71036003
BaseRepresentation
bin11011101010100000110101
3111122102220101
4123222200311
53324031041
6415234101
7115432630
oct33524065
914572811
107252021
114103607
122518931
13166bb4a
14d6ac17
15983b31
hex6ea835

7252021 has 4 divisors (see below), whose sum is σ = 8288032. Its totient is φ = 6216012.

The previous prime is 7252019. The next prime is 7252027. The reversal of 7252021 is 1202527.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1202527 = 7116937.

It is a cyclic number.

It is not a de Polignac number, because 7252021 - 21 = 7252019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7252021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7252027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 517995 + ... + 518008.

It is an arithmetic number, because the mean of its divisors is an integer number (2072008).

Almost surely, 27252021 is an apocalyptic number.

It is an amenable number.

7252021 is a deficient number, since it is larger than the sum of its proper divisors (1036011).

7252021 is a wasteful number, since it uses less digits than its factorization.

7252021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1036010.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 7252021 is about 2692.9576676955. The cubic root of 7252021 is about 193.5618143645.

Adding to 7252021 its reverse (1202527), we get a palindrome (8454548).

The spelling of 7252021 in words is "seven million, two hundred fifty-two thousand, twenty-one".

Divisors: 1 7 1036003 7252021