21132421051 has 8 divisors (see below), whose sum is σ = 24644223200. Its totient is φ = 18113503464.

The previous prime is 21132421049. The next prime is 21132421069. The reversal of 21132421051 is 15012423112.

It is not a de Polignac number, because 21132421051 - 2¹ = 21132421049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21132421001) 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, 30804936 + ... + 30805621.

It is an arithmetic number, because the mean of its divisors is an integer number (3080527900).

Almost surely, 2^21132421051 is an apocalyptic number.

21132421051 is a deficient number, since it is larger than the sum of its proper divisors (3511802149).

21132421051 is an frugal number, since it uses more digits than its factorization.

21132421051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61610578 (or 61610564 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

Adding to 21132421051 its reverse (15012423112), we get a palindrome (36144844163).

The spelling of 21132421051 in words is "twenty-one billion, one hundred thirty-two million, four hundred twenty-one thousand, fifty-one".