2221555021231 has 16 divisors (see below), whose sum is σ = 2822422263808. Its totient is φ = 1701013413600.

The previous prime is 2221555021219. The next prime is 2221555021241. The reversal of 2221555021231 is 1321205551222.

It is a cyclic number.

It is not a de Polignac number, because 2221555021231 - 2²³ = 2221546632623 is a prime.

It is a super-2 number, since 2×2221555021231² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a junction number, because it is equal to n+sod(n) for n = 2221555021193 and 2221555021202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221555021241) 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, 393750285 + ... + 393755926.

It is an arithmetic number, because the mean of its divisors is an integer number (176401391488).

Almost surely, 2^{2221555021231} is an apocalyptic number.

2221555021231 is a deficient number, since it is larger than the sum of its proper divisors (600867242577).

2221555021231 is a wasteful number, since it uses less digits than its factorization.

2221555021231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787506262.

The product of its (nonzero) digits is 12000, while the sum is 31.

The spelling of 2221555021231 in words is "two trillion, two hundred twenty-one billion, five hundred fifty-five million, twenty-one thousand, two hundred thirty-one".