21001233030 has 64 divisors (see below), whose sum is σ = 52076279808. Its totient is φ = 5414734080.

The previous prime is 21001232957. The next prime is 21001233031. The reversal of 21001233030 is 3033210012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001233031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1071882 + ... + 1091298.

It is an arithmetic number, because the mean of its divisors is an integer number (813691872).

Almost surely, 2^21001233030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21001233030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26038139904).

21001233030 is an abundant number, since it is smaller than the sum of its proper divisors (31075046778).

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

21001233030 is a wasteful number, since it uses less digits than its factorization.

21001233030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20621.

The product of its (nonzero) digits is 108, while the sum is 15.

Adding to 21001233030 its reverse (3033210012), we get a palindrome (24034443042).

The spelling of 21001233030 in words is "twenty-one billion, one million, two hundred thirty-three thousand, thirty".