21621265773007 has 24 divisors (see below), whose sum is σ = 22625650016480. Its totient is φ = 20659759464960.

The previous prime is 21621265772969. The next prime is 21621265773013. The reversal of 21621265773007 is 70037756212612.

It is not a de Polignac number, because 21621265773007 - 2¹⁹ = 21621265248719 is a prime.

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 23 ways as a sum of consecutive naturals, for example, 3146738782 + ... + 3146745652.

Almost surely, 2^{21621265773007} is an apocalyptic number.

21621265773007 is a deficient number, since it is larger than the sum of its proper divisors (1004384243473).

21621265773007 is a wasteful number, since it uses less digits than its factorization.

21621265773007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12223 (or 12200 counting only the distinct ones).

The product of its (nonzero) digits is 1481760, while the sum is 49.

The spelling of 21621265773007 in words is "twenty-one trillion, six hundred twenty-one billion, two hundred sixty-five million, seven hundred seventy-three thousand, seven".