21121321012252 has 24 divisors (see below), whose sum is σ = 37065371212800. Its totient is φ = 10531223274096.

The previous prime is 21121321012219. The next prime is 21121321012261. The reversal of 21121321012252 is 25221012312112.

It is a super-2 number, since 2×21121321012252² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9149223 + ... + 11222785.

It is an arithmetic number, because the mean of its divisors is an integer number (1544390467200).

Almost surely, 2^{21121321012252} is an apocalyptic number.

It is an amenable number.

21121321012252 is a deficient number, since it is larger than the sum of its proper divisors (15944050200548).

21121321012252 is a wasteful number, since it uses less digits than its factorization.

21121321012252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2080665 (or 2080663 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

Adding to 21121321012252 its reverse (25221012312112), we get a palindrome (46342333324364).

The spelling of 21121321012252 in words is "twenty-one trillion, one hundred twenty-one billion, three hundred twenty-one million, twelve thousand, two hundred fifty-two".