2156100214221 has 96 divisors (see below), whose sum is σ = 3414305157120. Its totient is φ = 1308008822400.

The previous prime is 2156100214189. The next prime is 2156100214237. The reversal of 2156100214221 is 1224120016512.

It is a happy number.

2156100214221 is a `hidden beast` number, since 2 + 1 + 5 + 610 + 0 + 2 + 1 + 42 + 2 + 1 = 666.

It is not a de Polignac number, because 2156100214221 - 2⁵ = 2156100214189 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156100214241) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 37422366 + ... + 37479936.

It is an arithmetic number, because the mean of its divisors is an integer number (35565678720).

Almost surely, 2^{2156100214221} is an apocalyptic number.

It is an amenable number.

2156100214221 is a deficient number, since it is larger than the sum of its proper divisors (1258204942899).

2156100214221 is a wasteful number, since it uses less digits than its factorization.

2156100214221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57767 (or 57764 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The spelling of 2156100214221 in words is "two trillion, one hundred fifty-six billion, one hundred million, two hundred fourteen thousand, two hundred twenty-one".