1221519952 has 20 divisors (see below), whose sum is σ = 2406810240. Its totient is φ = 600407648.

The previous prime is 1221519931. The next prime is 1221519953. The reversal of 1221519952 is 2599151221.

It is a super-2 number, since 2×1221519952² = 2984221986268164608, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221519953) 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, 646048 + ... + 647935.

It is an arithmetic number, because the mean of its divisors is an integer number (120340512).

Almost surely, 2^1221519952 is an apocalyptic number.

It is an amenable number.

1221519952 is a deficient number, since it is larger than the sum of its proper divisors (1185290288).

1221519952 is a wasteful number, since it uses less digits than its factorization.

1221519952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1294050 (or 1294044 counting only the distinct ones).

The product of its digits is 16200, while the sum is 37.

The square root of 1221519952 is about 34950.2496700667. The cubic root of 1221519952 is about 1068.9732929611.

The spelling of 1221519952 in words is "one billion, two hundred twenty-one million, five hundred nineteen thousand, nine hundred fifty-two".