21234212135 has 16 divisors (see below), whose sum is σ = 26359437312. Its totient is φ = 16404132000.

The previous prime is 21234212107. The next prime is 21234212161. The reversal of 21234212135 is 53121243212.

It is not a de Polignac number, because 21234212135 - 2¹⁰ = 21234211111 is a prime.

It is a super-3 number, since 3×21234212135³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74291 + ... + 219060.

It is an arithmetic number, because the mean of its divisors is an integer number (1647464832).

Almost surely, 2^21234212135 is an apocalyptic number.

21234212135 is a deficient number, since it is larger than the sum of its proper divisors (5125225177).

21234212135 is a wasteful number, since it uses less digits than its factorization.

21234212135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293854.

The product of its digits is 2880, while the sum is 26.

Adding to 21234212135 its reverse (53121243212), we get a palindrome (74355455347).

The spelling of 21234212135 in words is "twenty-one billion, two hundred thirty-four million, two hundred twelve thousand, one hundred thirty-five".