21461661936 has 160 divisors (see below), whose sum is σ = 72372867840. Its totient is φ = 6003244800.

The previous prime is 21461661913. The next prime is 21461661943. The reversal of 21461661936 is 63916616412.

21461661936 is a `hidden beast` number, since 2 + 14 + 6 + 16 + 619 + 3 + 6 = 666.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21461661891 and 21461661900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 111930 + ... + 235481.

It is an arithmetic number, because the mean of its divisors is an integer number (452330424).

Almost surely, 2^21461661936 is an apocalyptic number.

21461661936 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21461661936 is an abundant number, since it is smaller than the sum of its proper divisors (50911205904).

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

21461661936 is a wasteful number, since it uses less digits than its factorization.

21461661936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347452 (or 347440 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The spelling of 21461661936 in words is "twenty-one billion, four hundred sixty-one million, six hundred sixty-one thousand, nine hundred thirty-six".