1213211572 has 12 divisors (see below), whose sum is σ = 2159105760. Its totient is φ = 596324216.

The previous prime is 1213211557. The next prime is 1213211591. The reversal of 1213211572 is 2751123121.

It is a super-2 number, since 2×1213211572² = 2943764636869422368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2570128 + ... + 2570599.

It is an arithmetic number, because the mean of its divisors is an integer number (179925480).

Almost surely, 2^1213211572 is an apocalyptic number.

It is an amenable number.

1213211572 is a deficient number, since it is larger than the sum of its proper divisors (945894188).

1213211572 is a wasteful number, since it uses less digits than its factorization.

1213211572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5140790 (or 5140788 counting only the distinct ones).

The product of its digits is 840, while the sum is 25.

The square root of 1213211572 is about 34831.1867727759. The cubic root of 1213211572 is about 1066.5441747795.

Adding to 1213211572 its reverse (2751123121), we get a palindrome (3964334693).

The spelling of 1213211572 in words is "one billion, two hundred thirteen million, two hundred eleven thousand, five hundred seventy-two".