21001121230 has 16 divisors (see below), whose sum is σ = 39791598480. Its totient is φ = 7958319552.

The previous prime is 21001121189. The next prime is 21001121279. The reversal of 21001121230 is 3212110012.

21001121230 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 21001121230.

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, 55265919 + ... + 55266298.

It is an arithmetic number, because the mean of its divisors is an integer number (2486974905).

Almost surely, 2^21001121230 is an apocalyptic number.

21001121230 is a deficient number, since it is larger than the sum of its proper divisors (18790477250).

21001121230 is a wasteful number, since it uses less digits than its factorization.

21001121230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110532243.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21001121230 its reverse (3212110012), we get a palindrome (24213231242).

The spelling of 21001121230 in words is "twenty-one billion, one million, one hundred twenty-one thousand, two hundred thirty".