21263541655213 has 32 divisors (see below), whose sum is σ = 26297031196800. Its totient is φ = 16903562112000.

The previous prime is 21263541655189. The next prime is 21263541655219. The reversal of 21263541655213 is 31255614536212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21263541655213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21263541655219) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 57963673 + ... + 58329361.

It is an arithmetic number, because the mean of its divisors is an integer number (821782224900).

Almost surely, 2^{21263541655213} is an apocalyptic number.

It is an amenable number.

21263541655213 is a deficient number, since it is larger than the sum of its proper divisors (5033489541587).

21263541655213 is a wasteful number, since it uses less digits than its factorization.

21263541655213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387133.

The product of its digits is 1296000, while the sum is 46.

The spelling of 21263541655213 in words is "twenty-one trillion, two hundred sixty-three billion, five hundred forty-one million, six hundred fifty-five thousand, two hundred thirteen".