21034103212 has 24 divisors (see below), whose sum is σ = 37841479200. Its totient is φ = 10222807680.

The previous prime is 21034103203. The next prime is 21034103243. The reversal of 21034103212 is 21230143012.

It is a happy number.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 21034103212.

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, 83664 + ... + 221512.

It is an arithmetic number, because the mean of its divisors is an integer number (1576728300).

Almost surely, 2^21034103212 is an apocalyptic number.

It is an amenable number.

21034103212 is a deficient number, since it is larger than the sum of its proper divisors (16807375988).

21034103212 is a wasteful number, since it uses less digits than its factorization.

21034103212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138921 (or 138919 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21034103212 its reverse (21230143012), we get a palindrome (42264246224).

The spelling of 21034103212 in words is "twenty-one billion, thirty-four million, one hundred three thousand, two hundred twelve".