21201109974 has 24 divisors (see below), whose sum is σ = 50111714952. Its totient is φ = 6424578720.

The previous prime is 21201109961. The next prime is 21201110027. The reversal of 21201109974 is 47990110212.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53537959 + ... + 53538354.

It is an arithmetic number, because the mean of its divisors is an integer number (2087988123).

Almost surely, 2^21201109974 is an apocalyptic number.

21201109974 is an abundant number, since it is smaller than the sum of its proper divisors (28910604978).

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

21201109974 is a wasteful number, since it uses less digits than its factorization.

21201109974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107076332 (or 107076329 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The spelling of 21201109974 in words is "twenty-one billion, two hundred one million, one hundred nine thousand, nine hundred seventy-four".