1264561602021 has 12 divisors (see below), whose sum is σ = 1844322855648. Its totient is φ = 834856202664.

The previous prime is 1264561601993. The next prime is 1264561602043. The reversal of 1264561602021 is 1202061654621.

1264561602021 is a `hidden beast` number, since 1 + 2 + 6 + 45 + 6 + 1 + 602 + 0 + 2 + 1 = 666.

It is not a de Polignac number, because 1264561602021 - 2⁶ = 1264561601957 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264561602061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 682071135 + ... + 682072988.

It is an arithmetic number, because the mean of its divisors is an integer number (153693571304).

Almost surely, 2^{1264561602021} is an apocalyptic number.

It is an amenable number.

1264561602021 is a deficient number, since it is larger than the sum of its proper divisors (579761253627).

1264561602021 is a wasteful number, since it uses less digits than its factorization.

1264561602021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1364144232 (or 1364144229 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 1264561602021 in words is "one trillion, two hundred sixty-four billion, five hundred sixty-one million, six hundred two thousand, twenty-one".