1221029946 has 24 divisors (see below), whose sum is σ = 2784805920. Its totient is φ = 385588296.

The previous prime is 1221029923. The next prime is 1221029969. The reversal of 1221029946 is 6499201221.

It is an interprime number because it is at equal distance from previous prime (1221029923) and next prime (1221029969).

It is a self number, because there is not a number n which added to its sum of digits gives 1221029946.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1784790 + ... + 1785473.

It is an arithmetic number, because the mean of its divisors is an integer number (116033580).

Almost surely, 2^1221029946 is an apocalyptic number.

1221029946 is an abundant number, since it is smaller than the sum of its proper divisors (1563775974).

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

1221029946 is a wasteful number, since it uses less digits than its factorization.

1221029946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3570290 (or 3570287 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 1221029946 is about 34943.2389168491. The cubic root of 1221029946 is about 1068.8303362613.

The spelling of 1221029946 in words is "one billion, two hundred twenty-one million, twenty-nine thousand, nine hundred forty-six".