21422052051 has 16 divisors (see below), whose sum is σ = 29330311296. Its totient is φ = 13899928896.

The previous prime is 21422052017. The next prime is 21422052059. The reversal of 21422052051 is 15025022412.

It is not a de Polignac number, because 21422052051 - 2³¹ = 19274568403 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21422052059) 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, 256890 + ... + 329903.

It is an arithmetic number, because the mean of its divisors is an integer number (1833144456).

Almost surely, 2^21422052051 is an apocalyptic number.

21422052051 is a deficient number, since it is larger than the sum of its proper divisors (7908259245).

21422052051 is a wasteful number, since it uses less digits than its factorization.

21422052051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587122.

The product of its (nonzero) digits is 1600, while the sum is 24.

Adding to 21422052051 its reverse (15025022412), we get a palindrome (36447074463).

The spelling of 21422052051 in words is "twenty-one billion, four hundred twenty-two million, fifty-two thousand, fifty-one".