21454051212 has 72 divisors (see below), whose sum is σ = 59178555072. Its totient is φ = 6499317600.

The previous prime is 21454051193. The next prime is 21454051243. The reversal of 21454051212 is 21215045412.

It is a happy number.

21454051212 is a `hidden beast` number, since 2 + 1 + 45 + 405 + 1 + 212 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1947183 + ... + 1958169.

It is an arithmetic number, because the mean of its divisors is an integer number (821924376).

Almost surely, 2^21454051212 is an apocalyptic number.

21454051212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21454051212 is an abundant number, since it is smaller than the sum of its proper divisors (37724503860).

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

21454051212 is a wasteful number, since it uses less digits than its factorization.

21454051212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15939 (or 15934 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

Adding to 21454051212 its reverse (21215045412), we get a palindrome (42669096624).

The spelling of 21454051212 in words is "twenty-one billion, four hundred fifty-four million, fifty-one thousand, two hundred twelve".