21112212030 has 192 divisors, whose sum is σ = 63983001600. Its totient is φ = 4418862336.

The previous prime is 21112211993. The next prime is 21112212067. The reversal of 21112212030 is 3021221112.

It is an interprime number because it is at equal distance from previous prime (21112211993) and next prime (21112212067).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2422621 + ... + 2431319.

It is an arithmetic number, because the mean of its divisors is an integer number (333244800).

Almost surely, 2^21112212030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21112212030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31991500800).

21112212030 is an abundant number, since it is smaller than the sum of its proper divisors (42870789570).

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

21112212030 is a wasteful number, since it uses less digits than its factorization.

21112212030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8863 (or 8856 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21112212030 its reverse (3021221112), we get a palindrome (24133433142).

The spelling of 21112212030 in words is "twenty-one billion, one hundred twelve million, two hundred twelve thousand, thirty".