21065339406 has 192 divisors, whose sum is σ = 49306682880. Its totient is φ = 5968005120.

The previous prime is 21065339401. The next prime is 21065339411. The reversal of 21065339406 is 60493356012.

It is an interprime number because it is at equal distance from previous prime (21065339401) and next prime (21065339411).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21065339401) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 90409066 + ... + 90409298.

It is an arithmetic number, because the mean of its divisors is an integer number (256805640).

Almost surely, 2^21065339406 is an apocalyptic number.

21065339406 is an abundant number, since it is smaller than the sum of its proper divisors (28241343474).

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

21065339406 is a wasteful number, since it uses less digits than its factorization.

21065339406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379 (or 350 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 39.

The spelling of 21065339406 in words is "twenty-one billion, sixty-five million, three hundred thirty-nine thousand, four hundred six".