21067070976 has 400 divisors, whose sum is σ = 73378562400. Its totient is φ = 6015098880.

The previous prime is 21067070963. The next prime is 21067070977. The reversal of 21067070976 is 67907076012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21067070977) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 14224156 + ... + 14225636.

It is an arithmetic number, because the mean of its divisors is an integer number (183446406).

Almost surely, 2^21067070976 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 21067070976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36689281200).

21067070976 is an abundant number, since it is smaller than the sum of its proper divisors (52311491424).

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

21067070976 is an frugal number, since it uses more digits than its factorization.

21067070976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1532 (or 1493 counting only the distinct ones).

The product of its (nonzero) digits is 222264, while the sum is 45.

The spelling of 21067070976 in words is "twenty-one billion, sixty-seven million, seventy thousand, nine hundred seventy-six".