21132013021 has 8 divisors (see below), whose sum is σ = 24157022400. Its totient is φ = 18108541248.

The previous prime is 21132012997. The next prime is 21132013027. The reversal of 21132013021 is 12031023112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21132013021 - 2⁵ = 21132012989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21132012986 and 21132013004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21132013027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 354796 + ... + 410053.

It is an arithmetic number, because the mean of its divisors is an integer number (3019627800).

Almost surely, 2^21132013021 is an apocalyptic number.

It is an amenable number.

21132013021 is a deficient number, since it is larger than the sum of its proper divisors (3025009379).

21132013021 is an equidigital number, since it uses as much as digits as its factorization.

21132013021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768803.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21132013021 its reverse (12031023112), we get a palindrome (33163036133).

The spelling of 21132013021 in words is "twenty-one billion, one hundred thirty-two million, thirteen thousand, twenty-one".