21113012132 has 12 divisors (see below), whose sum is σ = 37195743900. Its totient is φ = 10485656736.

The previous prime is 21113012119. The next prime is 21113012153. The reversal of 21113012132 is 23121031112.

It can be written as a sum of positive squares in 2 ways, for example, as 7364042596 + 13748969536 = 85814^2 + 117256^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21113012132.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17711663 + ... + 17712854.

It is an arithmetic number, because the mean of its divisors is an integer number (3099645325).

Almost surely, 2^21113012132 is an apocalyptic number.

It is an amenable number.

21113012132 is a deficient number, since it is larger than the sum of its proper divisors (16082731768).

21113012132 is a wasteful number, since it uses less digits than its factorization.

21113012132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35424670 (or 35424668 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21113012132 its reverse (23121031112), we get a palindrome (44234043244).

The spelling of 21113012132 in words is "twenty-one billion, one hundred thirteen million, twelve thousand, one hundred thirty-two".