21611145546 has 40 divisors (see below), whose sum is σ = 48517755264. Its totient is φ = 7189913160.

The previous prime is 21611145533. The next prime is 21611145557. The reversal of 21611145546 is 64554111612.

21611145546 is a `hidden beast` number, since 2 + 1 + 61 + 11 + 45 + 546 = 666.

It is a super-2 number, since 2×21611145546² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21611145546.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 42810 + ... + 212261.

Almost surely, 2^21611145546 is an apocalyptic number.

21611145546 is an abundant number, since it is smaller than the sum of its proper divisors (26906609718).

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

21611145546 is a wasteful number, since it uses less digits than its factorization.

21611145546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255608 (or 255599 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The spelling of 21611145546 in words is "twenty-one billion, six hundred eleven million, one hundred forty-five thousand, five hundred forty-six".