21822155025 has 48 divisors (see below), whose sum is σ = 41430800640. Its totient is φ = 10023566400.

The previous prime is 21822155021. The next prime is 21822155053. The reversal of 21822155025 is 52055122812.

It is not a de Polignac number, because 21822155025 - 2² = 21822155021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (21822155021) 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, 680407 + ... + 711756.

It is an arithmetic number, because the mean of its divisors is an integer number (863141680).

Almost surely, 2^21822155025 is an apocalyptic number.

21822155025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21822155025 is a deficient number, since it is larger than the sum of its proper divisors (19608645615).

21822155025 is a wasteful number, since it uses less digits than its factorization.

21822155025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1392206 (or 1392201 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 33.

Adding to 21822155025 its reverse (52055122812), we get a palindrome (73877277837).

The spelling of 21822155025 in words is "twenty-one billion, eight hundred twenty-two million, one hundred fifty-five thousand, twenty-five".