21000012321234 has 32 divisors (see below), whose sum is σ = 42411097882944. Its totient is φ = 6931814312000.

The previous prime is 21000012321227. The next prime is 21000012321247. The reversal of 21000012321234 is 43212321000012.

It is a self number, because there is not a number n which added to its sum of digits gives 21000012321234.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40040709 + ... + 40561784.

It is an arithmetic number, because the mean of its divisors is an integer number (1325346808842).

Almost surely, 2^{21000012321234} is an apocalyptic number.

21000012321234 is an abundant number, since it is smaller than the sum of its proper divisors (21411085561710).

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

21000012321234 is a wasteful number, since it uses less digits than its factorization.

21000012321234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80602922.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21000012321234 its reverse (43212321000012), we get a palindrome (64212333321246).

The spelling of 21000012321234 in words is "twenty-one trillion, twelve million, three hundred twenty-one thousand, two hundred thirty-four".