21611725746 has 48 divisors (see below), whose sum is σ = 47571508800. Its totient is φ = 6540730560.

The previous prime is 21611725703. The next prime is 21611725777. The reversal of 21611725746 is 64752711612.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21611725698 and 21611725707.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 112846 + ... + 236553.

It is an arithmetic number, because the mean of its divisors is an integer number (991073100).

Almost surely, 2^21611725746 is an apocalyptic number.

21611725746 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21611725746 is an abundant number, since it is smaller than the sum of its proper divisors (25959783054).

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

21611725746 is a wasteful number, since it uses less digits than its factorization.

21611725746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349491 (or 349478 counting only the distinct ones).

The product of its digits is 141120, while the sum is 42.

The spelling of 21611725746 in words is "twenty-one billion, six hundred eleven million, seven hundred twenty-five thousand, seven hundred forty-six".