21213554610156 has 48 divisors (see below), whose sum is σ = 51917704720896. Its totient is φ = 6733687253184.

The previous prime is 21213554610091. The next prime is 21213554610323. The reversal of 21213554610156 is 65101645531212.

It is a super-3 number, since 3×21213554610156³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 508258666 + ... + 508300401.

It is an arithmetic number, because the mean of its divisors is an integer number (1081618848352).

Almost surely, 2^{21213554610156} is an apocalyptic number.

It is an amenable number.

21213554610156 is an abundant number, since it is smaller than the sum of its proper divisors (30704150110740).

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

21213554610156 is a wasteful number, since it uses less digits than its factorization.

21213554610156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1016559158 (or 1016559156 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 42.

The spelling of 21213554610156 in words is "twenty-one trillion, two hundred thirteen billion, five hundred fifty-four million, six hundred ten thousand, one hundred fifty-six".