21461551434 has 48 divisors (see below), whose sum is σ = 50436214920. Its totient is φ = 6568811520.

The previous prime is 21461551399. The next prime is 21461551457. The reversal of 21461551434 is 43415516412.

21461551434 is a `hidden beast` number, since 2 + 1 + 4 + 61 + 551 + 43 + 4 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 13996073025 + 7465478409 = 118305^2 + 86403^2 .

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 23 ways as a sum of consecutive naturals, for example, 842769 + ... + 867860.

Almost surely, 2^21461551434 is an apocalyptic number.

21461551434 is an abundant number, since it is smaller than the sum of its proper divisors (28974663486).

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

21461551434 is a wasteful number, since it uses less digits than its factorization.

21461551434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1710695 (or 1710692 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The spelling of 21461551434 in words is "twenty-one billion, four hundred sixty-one million, five hundred fifty-one thousand, four hundred thirty-four".