21013120230 has 16 divisors (see below), whose sum is σ = 50431488624. Its totient is φ = 5603498720.

The previous prime is 21013120223. The next prime is 21013120273. The reversal of 21013120230 is 3202131012.

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 7 ways as a sum of consecutive naturals, for example, 350218641 + ... + 350218700.

It is an arithmetic number, because the mean of its divisors is an integer number (3151968039).

Almost surely, 2^21013120230 is an apocalyptic number.

21013120230 is an abundant number, since it is smaller than the sum of its proper divisors (29418368394).

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

21013120230 is a wasteful number, since it uses less digits than its factorization.

21013120230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700437351.

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

Adding to 21013120230 its reverse (3202131012), we get a palindrome (24215251242).

The spelling of 21013120230 in words is "twenty-one billion, thirteen million, one hundred twenty thousand, two hundred thirty".