21043404401034 has 16 divisors (see below), whose sum is σ = 42714970128288. Its totient is φ = 6909774579312.

The previous prime is 21043404400981. The next prime is 21043404401099. The reversal of 21043404401034 is 43010440434012.

It is a junction number, because it is equal to n+sod(n) for n = 21043404400992 and 21043404401010.

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, 26173388157 + ... + 26173388960.

It is an arithmetic number, because the mean of its divisors is an integer number (2669685633018).

Almost surely, 2^{21043404401034} is an apocalyptic number.

21043404401034 is an abundant number, since it is smaller than the sum of its proper divisors (21671565727254).

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

21043404401034 is a wasteful number, since it uses less digits than its factorization.

21043404401034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52346777189.

The product of its (nonzero) digits is 18432, while the sum is 30.

Adding to 21043404401034 its reverse (43010440434012), we get a palindrome (64053844835046).

The spelling of 21043404401034 in words is "twenty-one trillion, forty-three billion, four hundred four million, four hundred one thousand, thirty-four".