21125141024 has 24 divisors (see below), whose sum is σ = 44789362380. Its totient is φ = 9750064896.

The previous prime is 21125141021. The next prime is 21125141029. The reversal of 21125141024 is 42014152112.

It can be written as a sum of positive squares in 2 ways, for example, as 15658017424 + 5467123600 = 125132^2 + 73940^2 .

It is not an unprimeable number, because it can be changed into a prime (21125141021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25390379 + ... + 25391210.

Almost surely, 2^21125141024 is an apocalyptic number.

It is an amenable number.

21125141024 is an abundant number, since it is smaller than the sum of its proper divisors (23664221356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21125141024 is a wasteful number, since it uses less digits than its factorization.

21125141024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50781612 (or 50781604 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

Adding to 21125141024 its reverse (42014152112), we get a palindrome (63139293136).

The spelling of 21125141024 in words is "twenty-one billion, one hundred twenty-five million, one hundred forty-one thousand, twenty-four".