2155220002001 has 16 divisors (see below), whose sum is σ = 2451022281216. Its totient is φ = 1877314800000.

The previous prime is 2155220001959. The next prime is 2155220002081. The reversal of 2155220002001 is 1002000225512.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2155220002001 - 2²⁶ = 2155152893137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155220002081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31254140 + ... + 31323021.

It is an arithmetic number, because the mean of its divisors is an integer number (153188892576).

Almost surely, 2^{2155220002001} is an apocalyptic number.

It is an amenable number.

2155220002001 is a deficient number, since it is larger than the sum of its proper divisors (295802279215).

2155220002001 is a wasteful number, since it uses less digits than its factorization.

2155220002001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62577304.

The product of its (nonzero) digits is 400, while the sum is 20.

Adding to 2155220002001 its reverse (1002000225512), we get a palindrome (3157220227513).

The spelling of 2155220002001 in words is "two trillion, one hundred fifty-five billion, two hundred twenty million, two thousand, one".