21312221034 has 32 divisors (see below), whose sum is σ = 46769353344. Its totient is φ = 6433876800.

The previous prime is 21312221033. The next prime is 21312221039. The reversal of 21312221034 is 43012221312.

It is a self number, because there is not a number n which added to its sum of digits gives 21312221034.

It is not an unprimeable number, because it can be changed into a prime (21312221033) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2573542 + ... + 2581809.

It is an arithmetic number, because the mean of its divisors is an integer number (1461542292).

Almost surely, 2^21312221034 is an apocalyptic number.

21312221034 is an abundant number, since it is smaller than the sum of its proper divisors (25457132310).

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

21312221034 is a wasteful number, since it uses less digits than its factorization.

21312221034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5155422.

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

Adding to 21312221034 its reverse (43012221312), we get a palindrome (64324442346).

The spelling of 21312221034 in words is "twenty-one billion, three hundred twelve million, two hundred twenty-one thousand, thirty-four".