21143969065602 has 24 divisors (see below), whose sum is σ = 45828081106236. Its totient is φ = 7045505360736.

The previous prime is 21143969065601. The next prime is 21143969065613. The reversal of 21143969065602 is 20656096934112.

21143969065602 is a `hidden beast` number, since 2 + 1 + 1 + 439 + 6 + 90 + 65 + 60 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 13890745166841 + 7253223898761 = 3727029^2 + 2693181^2 .

It is not an unprimeable number, because it can be changed into a prime (21143969065601) 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, 206974833 + ... + 207076964.

Almost surely, 2^{21143969065602} is an apocalyptic number.

21143969065602 is an abundant number, since it is smaller than the sum of its proper divisors (24684112040634).

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

21143969065602 is a wasteful number, since it uses less digits than its factorization.

21143969065602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414054642 (or 414054639 counting only the distinct ones).

The product of its (nonzero) digits is 4199040, while the sum is 54.

The spelling of 21143969065602 in words is "twenty-one trillion, one hundred forty-three billion, nine hundred sixty-nine million, sixty-five thousand, six hundred two".