21963237985 has 16 divisors (see below), whose sum is σ = 28387477440. Its totient is φ = 16216597440.

The previous prime is 21963237983. The next prime is 21963237997. The reversal of 21963237985 is 58973236912.

It is not a de Polignac number, because 21963237985 - 2¹ = 21963237983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21963237983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 499626 + ... + 541804.

It is an arithmetic number, because the mean of its divisors is an integer number (1774217340).

Almost surely, 2^21963237985 is an apocalyptic number.

It is an amenable number.

21963237985 is a deficient number, since it is larger than the sum of its proper divisors (6424239455).

21963237985 is a wasteful number, since it uses less digits than its factorization.

21963237985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50208.

The product of its digits is 4898880, while the sum is 55.

The spelling of 21963237985 in words is "twenty-one billion, nine hundred sixty-three million, two hundred thirty-seven thousand, nine hundred eighty-five".