21225025010 has 32 divisors (see below), whose sum is σ = 44486744832. Its totient is φ = 7139845440.

The previous prime is 21225024967. The next prime is 21225025139. The reversal of 21225025010 is 1052052212.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2856806 + ... + 2864225.

It is an arithmetic number, because the mean of its divisors is an integer number (1390210776).

Almost surely, 2^21225025010 is an apocalyptic number.

21225025010 is an abundant number, since it is smaller than the sum of its proper divisors (23261719822).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21225025010 is a wasteful number, since it uses less digits than its factorization.

21225025010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5721098.

The product of its (nonzero) digits is 400, while the sum is 20.

Adding to 21225025010 its reverse (1052052212), we get a palindrome (22277077222).

The spelling of 21225025010 in words is "twenty-one billion, two hundred twenty-five million, twenty-five thousand, ten".