21151670060556 has 96 divisors (see below), whose sum is σ = 63607012385280. Its totient is φ = 5953135269312.

The previous prime is 21151670060531. The next prime is 21151670060569. The reversal of 21151670060556 is 65506007615112.

It is a happy number.

21151670060556 is a `hidden beast` number, since 2 + 1 + 1 + 516 + 70 + 0 + 60 + 5 + 5 + 6 = 666.

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, 208743375 + ... + 208844678.

It is an arithmetic number, because the mean of its divisors is an integer number (662573045680).

Almost surely, 2^{21151670060556} is an apocalyptic number.

It is an amenable number.

21151670060556 is an abundant number, since it is smaller than the sum of its proper divisors (42455342324724).

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

21151670060556 is a wasteful number, since it uses less digits than its factorization.

21151670060556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417588140 (or 417588132 counting only the distinct ones).

The product of its (nonzero) digits is 378000, while the sum is 45.

Adding to 21151670060556 its reverse (65506007615112), we get a palindrome (86657677675668).

The spelling of 21151670060556 in words is "twenty-one trillion, one hundred fifty-one billion, six hundred seventy million, sixty thousand, five hundred fifty-six".