21107020501 has 16 divisors (see below), whose sum is σ = 24372033408. Its totient is φ = 17904600000.

The previous prime is 21107020477. The next prime is 21107020507. The reversal of 21107020501 is 10502070112.

It is a de Polignac number, because none of the positive numbers 2^k-21107020501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21107020507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2004751 + ... + 2015251.

It is an arithmetic number, because the mean of its divisors is an integer number (1523252088).

Almost surely, 2^21107020501 is an apocalyptic number.

It is an amenable number.

21107020501 is a deficient number, since it is larger than the sum of its proper divisors (3265012907).

21107020501 is a wasteful number, since it uses less digits than its factorization.

21107020501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13452.

The product of its (nonzero) digits is 140, while the sum is 19.

Adding to 21107020501 its reverse (10502070112), we get a palindrome (31609090613).

The spelling of 21107020501 in words is "twenty-one billion, one hundred seven million, twenty thousand, five hundred one".