21250253434602 has 16 divisors (see below), whose sum is σ = 44348354994240. Its totient is φ = 6775443124032.

The previous prime is 21250253434601. The next prime is 21250253434603. The reversal of 21250253434602 is 20643435205212.

It is an interprime number because it is at equal distance from previous prime (21250253434601) and next prime (21250253434603).

It is not an unprimeable number, because it can be changed into a prime (21250253434601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76993671727 + ... + 76993672002.

It is an arithmetic number, because the mean of its divisors is an integer number (2771772187140).

Almost surely, 2^{21250253434602} is an apocalyptic number.

21250253434602 is an abundant number, since it is smaller than the sum of its proper divisors (23098101559638).

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

21250253434602 is a wasteful number, since it uses less digits than its factorization.

21250253434602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153987343757.

The product of its (nonzero) digits is 345600, while the sum is 39.

Adding to 21250253434602 its reverse (20643435205212), we get a palindrome (41893688639814).

The spelling of 21250253434602 in words is "twenty-one trillion, two hundred fifty billion, two hundred fifty-three million, four hundred thirty-four thousand, six hundred two".