21202111230 has 32 divisors (see below), whose sum is σ = 50908220064. Its totient is φ = 5651323776.

The previous prime is 21202111171. The next prime is 21202111253. The reversal of 21202111230 is 3211120212.

It is a super-2 number, since 2×21202111230² (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 Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93289 + ... + 226068.

It is an arithmetic number, because the mean of its divisors is an integer number (1590881877).

Almost surely, 2^21202111230 is an apocalyptic number.

21202111230 is an abundant number, since it is smaller than the sum of its proper divisors (29706108834).

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

21202111230 is a wasteful number, since it uses less digits than its factorization.

21202111230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321580.

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

Adding to 21202111230 its reverse (3211120212), we get a palindrome (24413231442).

The spelling of 21202111230 in words is "twenty-one billion, two hundred two million, one hundred eleven thousand, two hundred thirty".