21070510437621 has 16 divisors (see below), whose sum is σ = 29771120376000. Its totient is φ = 13218377436288.

The previous prime is 21070510437619. The next prime is 21070510437689. The reversal of 21070510437621 is 12673401507012.

It is not a de Polignac number, because 21070510437621 - 2¹ = 21070510437619 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21070510437621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21070510437601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1240454856 + ... + 1240471841.

It is an arithmetic number, because the mean of its divisors is an integer number (1860695023500).

Almost surely, 2^{21070510437621} is an apocalyptic number.

It is an amenable number.

21070510437621 is a deficient number, since it is larger than the sum of its proper divisors (8700609938379).

21070510437621 is a wasteful number, since it uses less digits than its factorization.

21070510437621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2480926868.

The product of its (nonzero) digits is 70560, while the sum is 39.

The spelling of 21070510437621 in words is "twenty-one trillion, seventy billion, five hundred ten million, four hundred thirty-seven thousand, six hundred twenty-one".