21954870020 has 48 divisors (see below), whose sum is σ = 46400256000. Its totient is φ = 8725875840.

The previous prime is 21954870011. The next prime is 21954870061. The reversal of 21954870020 is 2007845912.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3264221 + ... + 3270939.

It is an arithmetic number, because the mean of its divisors is an integer number (966672000).

Almost surely, 2^21954870020 is an apocalyptic number.

21954870020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21954870020 is an abundant number, since it is smaller than the sum of its proper divisors (24445385980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21954870020 is a wasteful number, since it uses less digits than its factorization.

21954870020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7748 (or 7746 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 38.

The spelling of 21954870020 in words is "twenty-one billion, nine hundred fifty-four million, eight hundred seventy thousand, twenty".