21121300025 has 12 divisors (see below), whose sum is σ = 29931899712. Its totient is φ = 14483177040.

The previous prime is 21121300007. The next prime is 21121300043. The reversal of 21121300025 is 52000312112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21121300007) and next prime (21121300043).

It is not a de Polignac number, because 21121300025 - 2¹⁴ = 21121283641 is a prime.

It is a super-2 number, since 2×21121300025² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21121299976 and 21121300012.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60346397 + ... + 60346746.

It is an arithmetic number, because the mean of its divisors is an integer number (2494324976).

Almost surely, 2^21121300025 is an apocalyptic number.

21121300025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21121300025 is a deficient number, since it is larger than the sum of its proper divisors (8810599687).

21121300025 is a wasteful number, since it uses less digits than its factorization.

21121300025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120693160 (or 120693155 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

Adding to 21121300025 its reverse (52000312112), we get a palindrome (73121612137).

The spelling of 21121300025 in words is "twenty-one billion, one hundred twenty-one million, three hundred thousand, twenty-five".