21031332010021 has 4 divisors (see below), whose sum is σ = 21033759737952. Its totient is φ = 21028904282092.

The previous prime is 21031332010019. The next prime is 21031332010049. The reversal of 21031332010021 is 12001023313012.

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 21031332010021 - 2¹ = 21031332010019 is a prime.

It is a super-2 number, since 2×21031332010021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031332017021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1213850971 + ... + 1213868296.

It is an arithmetic number, because the mean of its divisors is an integer number (5258439934488).

Almost surely, 2^{21031332010021} is an apocalyptic number.

It is an amenable number.

21031332010021 is a deficient number, since it is larger than the sum of its proper divisors (2427727931).

21031332010021 is an equidigital number, since it uses as much as digits as its factorization.

21031332010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2427727930.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21031332010021 its reverse (12001023313012), we get a palindrome (33032355323033).

The spelling of 21031332010021 in words is "twenty-one trillion, thirty-one billion, three hundred thirty-two million, ten thousand, twenty-one".