1221852681 has 60 divisors (see below), whose sum is σ = 2134759440. Its totient is φ = 694416240.

The previous prime is 1221852659. The next prime is 1221852701. The reversal of 1221852681 is 1862581221.

1221852681 is a `hidden beast` number, since 122 + 1 + 8 + 526 + 8 + 1 = 666.

It is not a de Polignac number, because 1221852681 - 2¹³ = 1221844489 is a prime.

It is a super-2 number, since 2×1221852681² = 2985847948133775522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221852601) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 836730 + ... + 838188.

It is an arithmetic number, because the mean of its divisors is an integer number (35579324).

Almost surely, 2^1221852681 is an apocalyptic number.

It is an amenable number.

1221852681 is a deficient number, since it is larger than the sum of its proper divisors (912906759).

1221852681 is a wasteful number, since it uses less digits than its factorization.

1221852681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1696 (or 1680 counting only the distinct ones).

The product of its digits is 15360, while the sum is 36.

The square root of 1221852681 is about 34955.0093834918. The cubic root of 1221852681 is about 1069.0703431225.

The spelling of 1221852681 in words is "one billion, two hundred twenty-one million, eight hundred fifty-two thousand, six hundred eighty-one".