21156143532 has 48 divisors (see below), whose sum is σ = 49682918880. Its totient is φ = 7006629888.

The previous prime is 21156143509. The next prime is 21156143537. The reversal of 21156143532 is 23534165112.

It is a junction number, because it is equal to n+sod(n) for n = 21156143493 and 21156143502.

It is not an unprimeable number, because it can be changed into a prime (21156143537) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1970194 + ... + 1980902.

It is an arithmetic number, because the mean of its divisors is an integer number (1035060810).

Almost surely, 2^21156143532 is an apocalyptic number.

It is an amenable number.

21156143532 is an abundant number, since it is smaller than the sum of its proper divisors (28526775348).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21156143532 is a wasteful number, since it uses less digits than its factorization.

21156143532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11762 (or 11760 counting only the distinct ones).

The product of its digits is 21600, while the sum is 33.

The spelling of 21156143532 in words is "twenty-one billion, one hundred fifty-six million, one hundred forty-three thousand, five hundred thirty-two".