21885018901 has 12 divisors (see below), whose sum is σ = 23261856640. Its totient is φ = 20585476800.

The previous prime is 21885018893. The next prime is 21885018931. The reversal of 21885018901 is 10981058812.

It is not a de Polignac number, because 21885018901 - 2³ = 21885018893 is a prime.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21885018931) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 486826 + ... + 529876.

Almost surely, 2^21885018901 is an apocalyptic number.

It is an amenable number.

21885018901 is a deficient number, since it is larger than the sum of its proper divisors (1376837739).

21885018901 is a wasteful number, since it uses less digits than its factorization.

21885018901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44844 (or 44827 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 43.

The spelling of 21885018901 in words is "twenty-one billion, eight hundred eighty-five million, eighteen thousand, nine hundred one".