21621265773037 has 16 divisors (see below), whose sum is σ = 25507504000000. Its totient is φ = 17934417256320.

The previous prime is 21621265773013. The next prime is 21621265773067. The reversal of 21621265773037 is 73037756212612.

It is a cyclic number.

It is not a de Polignac number, because 21621265773037 - 2¹¹ = 21621265770989 is a prime.

It is a super-2 number, since 2×21621265773037² (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 (21621265773067) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14193889 + ... + 15643177.

It is an arithmetic number, because the mean of its divisors is an integer number (1594219000000).

Almost surely, 2^{21621265773037} is an apocalyptic number.

It is an amenable number.

21621265773037 is a deficient number, since it is larger than the sum of its proper divisors (3886238226963).

21621265773037 is a wasteful number, since it uses less digits than its factorization.

21621265773037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1518076.

The product of its (nonzero) digits is 4445280, while the sum is 52.

The spelling of 21621265773037 in words is "twenty-one trillion, six hundred twenty-one billion, two hundred sixty-five million, seven hundred seventy-three thousand, thirty-seven".