21200430135 has 32 divisors (see below), whose sum is σ = 35665663680. Its totient is φ = 10738022400.

The previous prime is 21200430073. The next prime is 21200430143. The reversal of 21200430135 is 53103400212.

It is not a de Polignac number, because 21200430135 - 2⁷ = 21200430007 is a prime.

It is a super-2 number, since 2×21200430135² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 372946 + ... + 426015.

It is an arithmetic number, because the mean of its divisors is an integer number (1114551990).

Almost surely, 2^21200430135 is an apocalyptic number.

21200430135 is a deficient number, since it is larger than the sum of its proper divisors (14465233545).

21200430135 is a wasteful number, since it uses less digits than its factorization.

21200430135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799059.

The product of its (nonzero) digits is 720, while the sum is 21.

Adding to 21200430135 its reverse (53103400212), we get a palindrome (74303830347).

The spelling of 21200430135 in words is "twenty-one billion, two hundred million, four hundred thirty thousand, one hundred thirty-five".