21012202230 has 64 divisors (see below), whose sum is σ = 52897701888. Its totient is φ = 5331539840.

The previous prime is 21012202193. The next prime is 21012202261. The reversal of 21012202230 is 3220221012.

It is a happy number.

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 31 ways as a sum of consecutive naturals, for example, 52072 + ... + 211508.

It is an arithmetic number, because the mean of its divisors is an integer number (826526592).

Almost surely, 2^21012202230 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21012202230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26448850944).

21012202230 is an abundant number, since it is smaller than the sum of its proper divisors (31885499658).

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

21012202230 is a wasteful number, since it uses less digits than its factorization.

21012202230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159661.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21012202230 its reverse (3220221012), we get a palindrome (24232423242).

The spelling of 21012202230 in words is "twenty-one billion, twelve million, two hundred two thousand, two hundred thirty".