21011231030 has 16 divisors (see below), whose sum is σ = 37822287744. Its totient is φ = 8404032000.

The previous prime is 21011230987. The next prime is 21011231047. The reversal of 21011231030 is 3013211012.

It is a junction number, because it is equal to n+sod(n) for n = 21011230996 and 21011231014.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181334 + ... + 273686.

It is an arithmetic number, because the mean of its divisors is an integer number (2363892984).

Almost surely, 2^21011231030 is an apocalyptic number.

21011231030 is a deficient number, since it is larger than the sum of its proper divisors (16811056714).

21011231030 is a wasteful number, since it uses less digits than its factorization.

21011231030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115111.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21011231030 its reverse (3013211012), we get a palindrome (24024442042).

It can be divided in two parts, 210112 and 31030, that added together give a palindrome (241142).

The spelling of 21011231030 in words is "twenty-one billion, eleven million, two hundred thirty-one thousand, thirty".