21312111030 has 64 divisors (see below), whose sum is σ = 61894679040. Its totient is φ = 4584789504.

The previous prime is 21312110993. The next prime is 21312111077. The reversal of 21312111030 is 3011121312.

It is a happy number.

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

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2981320 + ... + 2988459.

It is an arithmetic number, because the mean of its divisors is an integer number (967104360).

Almost surely, 2^21312111030 is an apocalyptic number.

21312111030 is an abundant number, since it is smaller than the sum of its proper divisors (40582568010).

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

21312111030 is a wasteful number, since it uses less digits than its factorization.

21312111030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5969813.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21312111030 its reverse (3011121312), we get a palindrome (24323232342).

The spelling of 21312111030 in words is "twenty-one billion, three hundred twelve million, one hundred eleven thousand, thirty".