21325031 has 8 divisors (see below), whose sum is σ = 26246304. Its totient is φ = 16872480.

The previous prime is 21325013. The next prime is 21325037. The reversal of 21325031 is 13052312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21325031 is a prime.

It is a super-2 number, since 2×21325031² = 909513894301922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21325037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117080 + ... + 117261.

It is an arithmetic number, because the mean of its divisors is an integer number (3280788).

Almost surely, 2^21325031 is an apocalyptic number.

21325031 is a deficient number, since it is larger than the sum of its proper divisors (4921273).

21325031 is a wasteful number, since it uses less digits than its factorization.

21325031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234361.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 21325031 is about 4617.9033121104. The cubic root of 21325031 is about 277.3085268444.

Adding to 21325031 its reverse (13052312), we get a palindrome (34377343).

The spelling of 21325031 in words is "twenty-one million, three hundred twenty-five thousand, thirty-one".