21250290025 has 12 divisors (see below), whose sum is σ = 26475249424. Its totient is φ = 16919658000.

The previous prime is 21250289993. The next prime is 21250290043. The reversal of 21250290025 is 52009205212.

It is not a de Polignac number, because 21250290025 - 2⁵ = 21250289993 is a prime.

It is a super-2 number, since 2×21250290025² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21250289975 and 21250290002.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2008971 + ... + 2019520.

Almost surely, 2^21250290025 is an apocalyptic number.

21250290025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21250290025 is a deficient number, since it is larger than the sum of its proper divisors (5224959399).

21250290025 is a wasteful number, since it uses less digits than its factorization.

21250290025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4028712 (or 4028707 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

Adding to 21250290025 its reverse (52009205212), we get a palindrome (73259495237).

The spelling of 21250290025 in words is "twenty-one billion, two hundred fifty million, two hundred ninety thousand, twenty-five".