21263505131 has 8 divisors (see below), whose sum is σ = 24417422400. Its totient is φ = 18313066440.

The previous prime is 21263505119. The next prime is 21263505181. The reversal of 21263505131 is 13150536212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21263505131 - 2²⁶ = 21196396267 is a prime.

It is a super-2 number, since 2×21263505131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21263505094 and 21263505103.

It is not an unprimeable number, because it can be changed into a prime (21263505101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50869421 + ... + 50869838.

It is an arithmetic number, because the mean of its divisors is an integer number (3052177800).

Almost surely, 2^21263505131 is an apocalyptic number.

21263505131 is a deficient number, since it is larger than the sum of its proper divisors (3153917269).

21263505131 is a wasteful number, since it uses less digits than its factorization.

21263505131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101739289.

The product of its (nonzero) digits is 5400, while the sum is 29.

The spelling of 21263505131 in words is "twenty-one billion, two hundred sixty-three million, five hundred five thousand, one hundred thirty-one".