2221111972 has 12 divisors (see below), whose sum is σ = 4020978780. Its totient is φ = 1072260896.

The previous prime is 2221111903. The next prime is 2221111973. The reversal of 2221111972 is 2791111222.

It can be written as a sum of positive squares in 2 ways, for example, as 1109289636 + 1111822336 = 33306^2 + 33344^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2221111972.

It is not an unprimeable number, because it can be changed into a prime (2221111973) 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, 9573643 + ... + 9573874.

It is an arithmetic number, because the mean of its divisors is an integer number (335081565).

Almost surely, 2^2221111972 is an apocalyptic number.

It is an amenable number.

2221111972 is a deficient number, since it is larger than the sum of its proper divisors (1799866808).

2221111972 is a wasteful number, since it uses less digits than its factorization.

2221111972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19147550 (or 19147548 counting only the distinct ones).

The product of its digits is 1008, while the sum is 28.

The square root of 2221111972 is about 47128.6746259642. The cubic root of 2221111972 is about 1304.7385200535.

The spelling of 2221111972 in words is "two billion, two hundred twenty-one million, one hundred eleven thousand, nine hundred seventy-two".