2221021231 has 16 divisors (see below), whose sum is σ = 2699292960. Its totient is φ = 1799521920.

The previous prime is 2221021189. The next prime is 2221021249. The reversal of 2221021231 is 1321201222.

It is a happy number.

It is not a de Polignac number, because 2221021231 - 2²¹ = 2218924079 is a prime.

It is a super-2 number, since 2×2221021231² = 9865870617105510722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221021261) 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, 263640 + ... + 271933.

It is an arithmetic number, because the mean of its divisors is an integer number (168705810).

Almost surely, 2^2221021231 is an apocalyptic number.

2221021231 is a deficient number, since it is larger than the sum of its proper divisors (478271729).

2221021231 is a wasteful number, since it uses less digits than its factorization.

2221021231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535626.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 2221021231 is about 47127.7119219679. The cubic root of 2221021231 is about 1304.7207519428.

Adding to 2221021231 its reverse (1321201222), we get a palindrome (3542222453).

Subtracting from 2221021231 its reverse (1321201222), we obtain a square (899820009 = 29997²).

The spelling of 2221021231 in words is "two billion, two hundred twenty-one million, twenty-one thousand, two hundred thirty-one".