21234140725 has 24 divisors (see below), whose sum is σ = 30156919040. Its totient is φ = 14529049920.

The previous prime is 21234140693. The next prime is 21234140729. The reversal of 21234140725 is 52704143212.

It is a happy number.

It is not a de Polignac number, because 21234140725 - 2⁵ = 21234140693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234140729) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50010 + ... + 212059.

Almost surely, 2^21234140725 is an apocalyptic number.

21234140725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21234140725 is a deficient number, since it is larger than the sum of its proper divisors (8922778315).

21234140725 is a wasteful number, since it uses less digits than its factorization.

21234140725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262549 (or 262544 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 31.

Adding to 21234140725 its reverse (52704143212), we get a palindrome (73938283937).

The spelling of 21234140725 in words is "twenty-one billion, two hundred thirty-four million, one hundred forty thousand, seven hundred twenty-five".