21001113032 has 8 divisors (see below), whose sum is σ = 39377086950. Its totient is φ = 10500556512.

The previous prime is 21001113031. The next prime is 21001113109. The reversal of 21001113032 is 23031110012.

It can be written as a sum of positive squares in only one way, i.e., 19682406436 + 1318706596 = 140294^2 + 36314^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 21001112998 and 21001113016.

It is not an unprimeable number, because it can be changed into a prime (21001113031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1312569557 + ... + 1312569572.

Almost surely, 2^21001113032 is an apocalyptic number.

It is an amenable number.

21001113032 is a deficient number, since it is larger than the sum of its proper divisors (18375973918).

21001113032 is a wasteful number, since it uses less digits than its factorization.

21001113032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2625139135 (or 2625139131 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21001113032 its reverse (23031110012), we get a palindrome (44032223044).

The spelling of 21001113032 in words is "twenty-one billion, one million, one hundred thirteen thousand, thirty-two".