21860025425 has 12 divisors (see below), whose sum is σ = 30978779136. Its totient is φ = 14989731600.

The previous prime is 21860025353. The next prime is 21860025427. The reversal of 21860025425 is 52452006812.

It is a de Polignac number, because none of the positive numbers 2^k-21860025425 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21860025427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62457041 + ... + 62457390.

It is an arithmetic number, because the mean of its divisors is an integer number (2581564928).

Almost surely, 2^21860025425 is an apocalyptic number.

21860025425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21860025425 is a deficient number, since it is larger than the sum of its proper divisors (9118753711).

21860025425 is a wasteful number, since it uses less digits than its factorization.

21860025425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124914448 (or 124914443 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 35.

The spelling of 21860025425 in words is "twenty-one billion, eight hundred sixty million, twenty-five thousand, four hundred twenty-five".