21975187485 has 64 divisors (see below), whose sum is σ = 37536952320. Its totient is φ = 10946016000.

The previous prime is 21975187469. The next prime is 21975187489. The reversal of 21975187485 is 58478157912.

It is a happy number.

It is not a de Polignac number, because 21975187485 - 2⁴ = 21975187469 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21975187489) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17764287 + ... + 17765523.

It is an arithmetic number, because the mean of its divisors is an integer number (586514880).

Almost surely, 2^21975187485 is an apocalyptic number.

It is an amenable number.

21975187485 is a deficient number, since it is larger than the sum of its proper divisors (15561764835).

21975187485 is a wasteful number, since it uses less digits than its factorization.

21975187485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2098.

The product of its digits is 5644800, while the sum is 57.

The spelling of 21975187485 in words is "twenty-one billion, nine hundred seventy-five million, one hundred eighty-seven thousand, four hundred eighty-five".