21367210306653 has 6 divisors (see below), whose sum is σ = 30863748220734. Its totient is φ = 14244806871096.

The previous prime is 21367210306619. The next prime is 21367210306667. The reversal of 21367210306653 is 35660301276312.

It is a happy number.

21367210306653 is a `hidden beast` number, since 2 + 13 + 67 + 210 + 306 + 65 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16156203392484 + 5211006914169 = 4019478^2 + 2282763^2 .

It is not a de Polignac number, because 21367210306653 - 2²⁰ = 21367209258077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21367210306599 and 21367210306608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21367210301653) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1187067239250 + ... + 1187067239267.

It is an arithmetic number, because the mean of its divisors is an integer number (5143958036789).

Almost surely, 2^{21367210306653} is an apocalyptic number.

It is an amenable number.

21367210306653 is a deficient number, since it is larger than the sum of its proper divisors (9496537914081).

21367210306653 is a wasteful number, since it uses less digits than its factorization.

21367210306653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2374134478523 (or 2374134478520 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 45.

The spelling of 21367210306653 in words is "twenty-one trillion, three hundred sixty-seven billion, two hundred ten million, three hundred six thousand, six hundred fifty-three".