21621350102031 has 12 divisors (see below), whose sum is σ = 31230955086552. Its totient is φ = 14414179839696.

The previous prime is 21621350102029. The next prime is 21621350102039. The reversal of 21621350102031 is 13020105312612.

21621350102031 is a `hidden beast` number, since 2 + 1 + 621 + 3 + 5 + 0 + 1 + 0 + 2 + 0 + 31 = 666.

It is not a de Polignac number, because 21621350102031 - 2¹ = 21621350102029 is a prime.

It is a super-2 number, since 2×21621350102031² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21621350101986 and 21621350102004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21621350102039) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1824781 + ... + 6824406.

It is an arithmetic number, because the mean of its divisors is an integer number (2602579590546).

Almost surely, 2^{21621350102031} is an apocalyptic number.

21621350102031 is a deficient number, since it is larger than the sum of its proper divisors (9609604984521).

21621350102031 is a wasteful number, since it uses less digits than its factorization.

21621350102031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8926950 (or 8926947 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

Adding to 21621350102031 its reverse (13020105312612), we get a palindrome (34641455414643).

The spelling of 21621350102031 in words is "twenty-one trillion, six hundred twenty-one billion, three hundred fifty million, one hundred two thousand, thirty-one".