2021556656156 has 96 divisors (see below), whose sum is σ = 3739576608768. Its totient is φ = 955177090560.

The previous prime is 2021556656099. The next prime is 2021556656173. The reversal of 2021556656156 is 6516566551202.

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, 550381136 + ... + 550384808.

It is an arithmetic number, because the mean of its divisors is an integer number (38953923008).

Almost surely, 2^{2021556656156} is an apocalyptic number.

It is an amenable number.

2021556656156 is a deficient number, since it is larger than the sum of its proper divisors (1718019952612).

2021556656156 is a wasteful number, since it uses less digits than its factorization.

2021556656156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4531 (or 4529 counting only the distinct ones).

The product of its (nonzero) digits is 3240000, while the sum is 50.

The spelling of 2021556656156 in words is "two trillion, twenty-one billion, five hundred fifty-six million, six hundred fifty-six thousand, one hundred fifty-six".