21115321425152 has 72 divisors (see below), whose sum is σ = 42808500689472. Its totient is φ = 10392716902400.

The previous prime is 21115321425151. The next prime is 21115321425161. The reversal of 21115321425152 is 25152412351112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21115321425151) 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, 10744643 + ... + 12556989.

It is an arithmetic number, because the mean of its divisors is an integer number (594562509576).

Almost surely, 2^{21115321425152} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21115321425152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21404250344736).

21115321425152 is an abundant number, since it is smaller than the sum of its proper divisors (21693179264320).

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

21115321425152 is an equidigital number, since it uses as much as digits as its factorization.

21115321425152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1813075 (or 1813061 counting only the distinct ones).

The product of its digits is 24000, while the sum is 35.

Adding to 21115321425152 its reverse (25152412351112), we get a palindrome (46267733776264).

The spelling of 21115321425152 in words is "twenty-one trillion, one hundred fifteen billion, three hundred twenty-one million, four hundred twenty-five thousand, one hundred fifty-two".