2221588021651 has 4 divisors (see below), whose sum is σ = 2221592432632. Its totient is φ = 2221583610672.

The previous prime is 2221588021607. The next prime is 2221588021663. The reversal of 2221588021651 is 1561208851222.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2221588021651 - 2²⁷ = 2221453803923 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2221588021598 and 2221588021607.

It is not an unprimeable number, because it can be changed into a prime (2221588021691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1335666 + ... + 2495431.

It is an arithmetic number, because the mean of its divisors is an integer number (555398108158).

Almost surely, 2^{2221588021651} is an apocalyptic number.

2221588021651 is a deficient number, since it is larger than the sum of its proper divisors (4410981).

2221588021651 is an equidigital number, since it uses as much as digits as its factorization.

2221588021651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4410980.

The product of its (nonzero) digits is 153600, while the sum is 43.

The spelling of 2221588021651 in words is "two trillion, two hundred twenty-one billion, five hundred eighty-eight million, twenty-one thousand, six hundred fifty-one".