21121331443030 has 96 divisors (see below), whose sum is σ = 47970087369120. Its totient is φ = 6636462658560.

The previous prime is 21121331442983. The next prime is 21121331443033. The reversal of 21121331443030 is 3034413312112.

It is a super-2 number, since 2×21121331443030² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21121331443030.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121331443033) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11041731 + ... + 12812590.

It is an arithmetic number, because the mean of its divisors is an integer number (499688410095).

Almost surely, 2^{21121331443030} is an apocalyptic number.

21121331443030 is an abundant number, since it is smaller than the sum of its proper divisors (26848755926090).

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

21121331443030 is a wasteful number, since it uses less digits than its factorization.

21121331443030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23854494 (or 23854487 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

Adding to 21121331443030 its reverse (3034413312112), we get a palindrome (24155744755142).

The spelling of 21121331443030 in words is "twenty-one trillion, one hundred twenty-one billion, three hundred thirty-one million, four hundred forty-three thousand, thirty".