21437735312 has 40 divisors (see below), whose sum is σ = 48573218496. Its totient is φ = 8973933696.

The previous prime is 21437735309. The next prime is 21437735323. The reversal of 21437735312 is 21353773412.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2220863 + ... + 2230494.

Almost surely, 2^21437735312 is an apocalyptic number.

It is an amenable number.

21437735312 is an abundant number, since it is smaller than the sum of its proper divisors (27135483184).

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

21437735312 is a wasteful number, since it uses less digits than its factorization.

21437735312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4451415 (or 4451409 counting only the distinct ones).

The product of its digits is 105840, while the sum is 38.

The spelling of 21437735312 in words is "twenty-one billion, four hundred thirty-seven million, seven hundred thirty-five thousand, three hundred twelve".