21234166125 has 32 divisors (see below), whose sum is σ = 36552072960. Its totient is φ = 10934369600.

The previous prime is 21234166123. The next prime is 21234166133. The reversal of 21234166125 is 52166143212.

It is not a de Polignac number, because 21234166125 - 2¹ = 21234166123 is a prime.

It is a super-2 number, since 2×21234166125² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234166123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 965409 + ... + 987158.

It is an arithmetic number, because the mean of its divisors is an integer number (1142252280).

Almost surely, 2^21234166125 is an apocalyptic number.

21234166125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21234166125 is a deficient number, since it is larger than the sum of its proper divisors (15317906835).

21234166125 is a wasteful number, since it uses less digits than its factorization.

21234166125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1952614 (or 1952604 counting only the distinct ones).

The product of its digits is 17280, while the sum is 33.

The spelling of 21234166125 in words is "twenty-one billion, two hundred thirty-four million, one hundred sixty-six thousand, one hundred twenty-five".