21622025 has 24 divisors (see below), whose sum is σ = 27721440. Its totient is φ = 16722560.

The previous prime is 21621997. The next prime is 21622033. The reversal of 21622025 is 52022612.

It is not a de Polignac number, because 21622025 - 2⁶ = 21621961 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21621988 and 21622006.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 157757 + ... + 157893.

It is an arithmetic number, because the mean of its divisors is an integer number (1155060).

Almost surely, 2^21622025 is an apocalyptic number.

21622025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21622025 is a deficient number, since it is larger than the sum of its proper divisors (6099415).

21622025 is a wasteful number, since it uses less digits than its factorization.

21622025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313 (or 308 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 21622025 is about 4649.9489244507. The cubic root of 21622025 is about 278.5899561892.

Adding to 21622025 its reverse (52022612), we get a palindrome (73644637).

The spelling of 21622025 in words is "twenty-one million, six hundred twenty-two thousand, twenty-five".