53621021 has 4 divisors (see below), whose sum is σ = 56443200. Its totient is φ = 50798844.

The previous prime is 53621011. The next prime is 53621063. The reversal of 53621021 is 12012635.

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.

It is a cyclic number.

It is not a de Polignac number, because 53621021 - 2²² = 49426717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 53620984 and 53621002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53621011) 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, 1411061 + ... + 1411098.

It is an arithmetic number, because the mean of its divisors is an integer number (14110800).

Almost surely, 2^53621021 is an apocalyptic number.

It is an amenable number.

53621021 is a deficient number, since it is larger than the sum of its proper divisors (2822179).

53621021 is a wasteful number, since it uses less digits than its factorization.

53621021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2822178.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 53621021 is about 7322.6375712581. The cubic root of 53621021 is about 377.0900093958.

Adding to 53621021 its reverse (12012635), we get a palindrome (65633656).

The spelling of 53621021 in words is "fifty-three million, six hundred twenty-one thousand, twenty-one".