21230772501 has 32 divisors (see below), whose sum is σ = 30070656000. Its totient is φ = 13286592000.

The previous prime is 21230772469. The next prime is 21230772509. The reversal of 21230772501 is 10527703212.

It is not a de Polignac number, because 21230772501 - 2⁵ = 21230772469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230772509) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2843365 + ... + 2850821.

It is an arithmetic number, because the mean of its divisors is an integer number (939708000).

Almost surely, 2^21230772501 is an apocalyptic number.

It is an amenable number.

21230772501 is a deficient number, since it is larger than the sum of its proper divisors (8839883499).

21230772501 is a wasteful number, since it uses less digits than its factorization.

21230772501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7929.

The product of its (nonzero) digits is 5880, while the sum is 30.

The spelling of 21230772501 in words is "twenty-one billion, two hundred thirty million, seven hundred seventy-two thousand, five hundred one".