21043653131 has 2 divisors, whose sum is σ = 21043653132. Its totient is φ = 21043653130.

The previous prime is 21043653109. The next prime is 21043653139. The reversal of 21043653131 is 13135634012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21043653131 - 2⁶ = 21043653067 is a prime.

It is a super-2 number, since 2×21043653131² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21043653094 and 21043653103.

It is not a weakly prime, because it can be changed into another prime (21043653139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10521826565 + 10521826566.

It is an arithmetic number, because the mean of its divisors is an integer number (10521826566).

Almost surely, 2^21043653131 is an apocalyptic number.

21043653131 is a deficient number, since it is larger than the sum of its proper divisors (1).

21043653131 is an equidigital number, since it uses as much as digits as its factorization.

21043653131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 29.

The spelling of 21043653131 in words is "twenty-one billion, forty-three million, six hundred fifty-three thousand, one hundred thirty-one".