21529431711 has 12 divisors (see below), whose sum is σ = 31099696992. Its totient is φ = 14352202656.

The previous prime is 21529431709. The next prime is 21529431719. The reversal of 21529431711 is 11713492512.

It is a happy number.

21529431711 is a `hidden beast` number, since 2 + 152 + 9 + 431 + 71 + 1 = 666.

It is not a de Polignac number, because 21529431711 - 2¹ = 21529431709 is a prime.

It is a super-2 number, since 2×21529431711² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21529431719) 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, 160570 + ... + 262376.

It is an arithmetic number, because the mean of its divisors is an integer number (2591641416).

Almost surely, 2^21529431711 is an apocalyptic number.

21529431711 is a deficient number, since it is larger than the sum of its proper divisors (9570265281).

21529431711 is a wasteful number, since it uses less digits than its factorization.

21529431711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125310 (or 125307 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The spelling of 21529431711 in words is "twenty-one billion, five hundred twenty-nine million, four hundred thirty-one thousand, seven hundred eleven".