21950734656 has 112 divisors (see below), whose sum is σ = 61225582400. Its totient is φ = 6921510912.

The previous prime is 21950734639. The next prime is 21950734681. The reversal of 21950734656 is 65643705912.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

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, 2669880 + ... + 2678088.

Almost surely, 2^21950734656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21950734656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30612791200).

21950734656 is an abundant number, since it is smaller than the sum of its proper divisors (39274847744).

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

21950734656 is a wasteful number, since it uses less digits than its factorization.

21950734656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8976 (or 8966 counting only the distinct ones).

The product of its (nonzero) digits is 1360800, while the sum is 48.

The spelling of 21950734656 in words is "twenty-one billion, nine hundred fifty million, seven hundred thirty-four thousand, six hundred fifty-six".