21030211230 has 128 divisors (see below), whose sum is σ = 60576380928. Its totient is φ = 4568458752.

The previous prime is 21030211211. The next prime is 21030211249. The reversal of 21030211230 is 3211203012.

It is an interprime number because it is at equal distance from previous prime (21030211211) and next prime (21030211249).

It is a super-2 number, since 2×21030211230² (a number of 21 digits) contains 22 as substring.

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 63 ways as a sum of consecutive naturals, for example, 744444 + ... + 772176.

It is an arithmetic number, because the mean of its divisors is an integer number (473252976).

Almost surely, 2^21030211230 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21030211230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30288190464).

21030211230 is an abundant number, since it is smaller than the sum of its proper divisors (39546169698).

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

21030211230 is a wasteful number, since it uses less digits than its factorization.

21030211230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27930.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21030211230 its reverse (3211203012), we get a palindrome (24241414242).

The spelling of 21030211230 in words is "twenty-one billion, thirty million, two hundred eleven thousand, two hundred thirty".