21954212192 has 24 divisors (see below), whose sum is σ = 47151661032. Its totient is φ = 9979187200.

The previous prime is 21954212179. The next prime is 21954212201. The reversal of 21954212192 is 29121245912.

It is a super-2 number, since 2×21954212192² (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 3 ways as a sum of consecutive naturals, for example, 31184609 + ... + 31185312.

It is an arithmetic number, because the mean of its divisors is an integer number (1964652543).

Almost surely, 2^21954212192 is an apocalyptic number.

21954212192 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21954212192 is an abundant number, since it is smaller than the sum of its proper divisors (25197448840).

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

21954212192 is a wasteful number, since it uses less digits than its factorization.

21954212192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62369942 (or 62369934 counting only the distinct ones).

The product of its digits is 25920, while the sum is 38.

The spelling of 21954212192 in words is "twenty-one billion, nine hundred fifty-four million, two hundred twelve thousand, one hundred ninety-two".