21121020230 has 16 divisors (see below), whose sum is σ = 38022025104. Its totient is φ = 8447477280.

The previous prime is 21121020229. The next prime is 21121020233. The reversal of 21121020230 is 3202012112.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121020233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17012 + ... + 206231.

It is an arithmetic number, because the mean of its divisors is an integer number (2376376569).

Almost surely, 2^21121020230 is an apocalyptic number.

21121020230 is a deficient number, since it is larger than the sum of its proper divisors (16901004874).

21121020230 is a wasteful number, since it uses less digits than its factorization.

21121020230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232711.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21121020230 its reverse (3202012112), we get a palindrome (24323032342).

The spelling of 21121020230 in words is "twenty-one billion, one hundred twenty-one million, twenty thousand, two hundred thirty".