1221572632 has 32 divisors (see below), whose sum is σ = 2619465120. Its totient is φ = 523169280.

The previous prime is 1221572623. The next prime is 1221572647. The reversal of 1221572632 is 2362751221.

It is a junction number, because it is equal to n+sod(n) for n = 1221572594 and 1221572603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84048 + ... + 97504.

It is an arithmetic number, because the mean of its divisors is an integer number (81858285).

Almost surely, 2^1221572632 is an apocalyptic number.

It is an amenable number.

1221572632 is an abundant number, since it is smaller than the sum of its proper divisors (1397892488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221572632 is a wasteful number, since it uses less digits than its factorization.

1221572632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15091 (or 15087 counting only the distinct ones).

The product of its digits is 10080, while the sum is 31.

The square root of 1221572632 is about 34951.0033046263. The cubic root of 1221572632 is about 1068.9886598007.

The spelling of 1221572632 in words is "one billion, two hundred twenty-one million, five hundred seventy-two thousand, six hundred thirty-two".