21934156512 has 96 divisors (see below), whose sum is σ = 57977754912. Its totient is φ = 7260667904.

The previous prime is 21934156501. The next prime is 21934156523. The reversal of 21934156512 is 21565143912.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21934156501) and next prime (21934156523).

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×21934156512² (a number of 21 digits) contains 22 as substring.

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, 18022528 + ... + 18023744.

It is an arithmetic number, because the mean of its divisors is an integer number (603934947).

Almost surely, 2^21934156512 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 21934156512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28988877456).

21934156512 is an abundant number, since it is smaller than the sum of its proper divisors (36043598400).

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

21934156512 is a wasteful number, since it uses less digits than its factorization.

21934156512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2380 (or 2372 counting only the distinct ones).

The product of its digits is 64800, while the sum is 39.

The spelling of 21934156512 in words is "twenty-one billion, nine hundred thirty-four million, one hundred fifty-six thousand, five hundred twelve".