21623160025 has 12 divisors (see below), whose sum is σ = 26821510992. Its totient is φ = 17292855440.

The previous prime is 21623160023. The next prime is 21623160043. The reversal of 21623160025 is 52006132612.

It is not a de Polignac number, because 21623160025 - 2¹ = 21623160023 is a prime.

It is a super-2 number, since 2×21623160025² (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 = 21623159975 and 21623160002.

It is not an unprimeable number, because it can be changed into a prime (21623160023) 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, 63199 + ... + 217348.

It is an arithmetic number, because the mean of its divisors is an integer number (2235125916).

Almost surely, 2^21623160025 is an apocalyptic number.

21623160025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21623160025 is a deficient number, since it is larger than the sum of its proper divisors (5198350967).

21623160025 is a wasteful number, since it uses less digits than its factorization.

21623160025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283640 (or 283635 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

Adding to 21623160025 its reverse (52006132612), we get a palindrome (73629292637).

The spelling of 21623160025 in words is "twenty-one billion, six hundred twenty-three million, one hundred sixty thousand, twenty-five".