21224521630025 has 24 divisors (see below), whose sum is σ = 30086708077440. Its totient is φ = 14549830824960.

The previous prime is 21224521629989. The next prime is 21224521630051. The reversal of 21224521630025 is 52003612542212.

It is a happy number.

It is not a de Polignac number, because 21224521630025 - 2²⁸ = 21224253194569 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

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, 16576280 + ... + 17810729.

It is an arithmetic number, because the mean of its divisors is an integer number (1253612836560).

Almost surely, 2^{21224521630025} is an apocalyptic number.

21224521630025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21224521630025 is a deficient number, since it is larger than the sum of its proper divisors (8862186447415).

21224521630025 is a wasteful number, since it uses less digits than its factorization.

21224521630025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34390553 (or 34390548 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 35.

The spelling of 21224521630025 in words is "twenty-one trillion, two hundred twenty-four billion, five hundred twenty-one million, six hundred thirty thousand, twenty-five".