21400412034 has 32 divisors (see below), whose sum is σ = 43416705024. Its totient is φ = 7030884560.

The previous prime is 21400412021. The next prime is 21400412071. The reversal of 21400412034 is 43021400412.

It is a self number, because there is not a number n which added to its sum of digits gives 21400412034.

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, 2100637 + ... + 2110799.

It is an arithmetic number, because the mean of its divisors is an integer number (1356772032).

Almost surely, 2^21400412034 is an apocalyptic number.

21400412034 is an abundant number, since it is smaller than the sum of its proper divisors (22016292990).

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

21400412034 is a wasteful number, since it uses less digits than its factorization.

21400412034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15182.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21400412034 its reverse (43021400412), we get a palindrome (64421812446).

The spelling of 21400412034 in words is "twenty-one billion, four hundred million, four hundred twelve thousand, thirty-four".