21112031034 has 24 divisors (see below), whose sum is σ = 45944252640. Its totient is φ = 7006340808.

The previous prime is 21112031033. The next prime is 21112031041. The reversal of 21112031034 is 43013021112.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21112030998 and 21112031016.

It is not an unprimeable number, because it can be changed into a prime (21112031033) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2579374 + ... + 2587545.

It is an arithmetic number, because the mean of its divisors is an integer number (1914343860).

Almost surely, 2^21112031034 is an apocalyptic number.

21112031034 is an abundant number, since it is smaller than the sum of its proper divisors (24832221606).

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

21112031034 is a wasteful number, since it uses less digits than its factorization.

21112031034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5167154 (or 5167151 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21112031034 its reverse (43013021112), we get a palindrome (64125052146).

The spelling of 21112031034 in words is "twenty-one billion, one hundred twelve million, thirty-one thousand, thirty-four".