1221802971 has 16 divisors (see below), whose sum is σ = 1748532384. Its totient is φ = 756117504.

The previous prime is 1221802943. The next prime is 1221803017. The reversal of 1221802971 is 1792081221.

It is not a de Polignac number, because 1221802971 - 2⁷ = 1221802843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221802921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160366 + ... + 167811.

It is an arithmetic number, because the mean of its divisors is an integer number (109283274).

Almost surely, 2^1221802971 is an apocalyptic number.

1221802971 is a deficient number, since it is larger than the sum of its proper divisors (526729413).

1221802971 is a wasteful number, since it uses less digits than its factorization.

1221802971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328270.

The product of its (nonzero) digits is 4032, while the sum is 33.

The square root of 1221802971 is about 34954.2983193770. The cubic root of 1221802971 is about 1069.0558448641.

The spelling of 1221802971 in words is "one billion, two hundred twenty-one million, eight hundred two thousand, nine hundred seventy-one".