21010203025 has 48 divisors (see below), whose sum is σ = 31156648704. Its totient is φ = 13752910080.

The previous prime is 21010203017. The next prime is 21010203029. The reversal of 21010203025 is 52030201012.

It is not a de Polignac number, because 21010203025 - 2³ = 21010203017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21010203029) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 312564 + ... + 373786.

It is an arithmetic number, because the mean of its divisors is an integer number (649096848).

Almost surely, 2^21010203025 is an apocalyptic number.

21010203025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21010203025 is a deficient number, since it is larger than the sum of its proper divisors (10146445679).

21010203025 is a wasteful number, since it uses less digits than its factorization.

21010203025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61330 (or 61325 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

Adding to 21010203025 its reverse (52030201012), we get a palindrome (73040404037).

The spelling of 21010203025 in words is "twenty-one billion, ten million, two hundred three thousand, twenty-five".