21032701 has 4 divisors (see below), whose sum is σ = 21078592. Its totient is φ = 20986812.

The previous prime is 21032699. The next prime is 21032731. The reversal of 21032701 is 10723012.

It is a happy number.

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 21032701 - 2¹ = 21032699 is a prime.

It is a super-2 number, since 2×21032701² = 884749022710802, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21032731) 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, 22251 + ... + 23176.

It is an arithmetic number, because the mean of its divisors is an integer number (5269648).

Almost surely, 2^21032701 is an apocalyptic number.

It is an amenable number.

21032701 is a deficient number, since it is larger than the sum of its proper divisors (45891).

21032701 is an equidigital number, since it uses as much as digits as its factorization.

21032701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45890.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 21032701 is about 4586.1422786477. The cubic root of 21032701 is about 276.0355490512.

Adding to 21032701 its reverse (10723012), we get a palindrome (31755713).

The spelling of 21032701 in words is "twenty-one million, thirty-two thousand, seven hundred one".