21906739092 has 192 divisors, whose sum is σ = 62999552000. Its totient is φ = 5905872000.

The previous prime is 21906739067. The next prime is 21906739109. The reversal of 21906739092 is 29093760912.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 29169717 + ... + 29170467.

Almost surely, 2^21906739092 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 21906739092, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31499776000).

21906739092 is an abundant number, since it is smaller than the sum of its proper divisors (41092812908).

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

21906739092 is a wasteful number, since it uses less digits than its factorization.

21906739092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1171 (or 1155 counting only the distinct ones).

The product of its (nonzero) digits is 367416, while the sum is 48.

The spelling of 21906739092 in words is "twenty-one billion, nine hundred six million, seven hundred thirty-nine thousand, ninety-two".