21200421532 has 12 divisors (see below), whose sum is σ = 38005634016. Its totient is φ = 10341668960.

The previous prime is 21200421527. The next prime is 21200421533. The reversal of 21200421532 is 23512400212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200421533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64635268 + ... + 64635595.

It is an arithmetic number, because the mean of its divisors is an integer number (3167136168).

Almost surely, 2^21200421532 is an apocalyptic number.

It is an amenable number.

21200421532 is a deficient number, since it is larger than the sum of its proper divisors (16805212484).

21200421532 is a wasteful number, since it uses less digits than its factorization.

21200421532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129270908 (or 129270906 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 21200421532 its reverse (23512400212), we get a palindrome (44712821744).

The spelling of 21200421532 in words is "twenty-one billion, two hundred million, four hundred twenty-one thousand, five hundred thirty-two".