21132030021 has 16 divisors (see below), whose sum is σ = 28275053568. Its totient is φ = 14038556400.

The previous prime is 21132029987. The next prime is 21132030041. The reversal of 21132030021 is 12003023112.

It is not a de Polignac number, because 21132030021 - 2⁹ = 21132029509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21132030041) 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, 2743786 + ... + 2751476.

It is an arithmetic number, because the mean of its divisors is an integer number (1767190848).

Almost surely, 2^21132030021 is an apocalyptic number.

It is an amenable number.

21132030021 is a deficient number, since it is larger than the sum of its proper divisors (7143023547).

21132030021 is a wasteful number, since it uses less digits than its factorization.

21132030021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10792.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21132030021 its reverse (12003023112), we get a palindrome (33135053133).

The spelling of 21132030021 in words is "twenty-one billion, one hundred thirty-two million, thirty thousand, twenty-one".