21221140434004 has 24 divisors (see below), whose sum is σ = 42490456037568. Its totient is φ = 9084451221120.

The previous prime is 21221140433921. The next prime is 21221140434017. The reversal of 21221140434004 is 40043404112212.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

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, 430110334 + ... + 430159669.

It is an arithmetic number, because the mean of its divisors is an integer number (1770435668232).

Almost surely, 2^{21221140434004} is an apocalyptic number.

It is an amenable number.

21221140434004 is an abundant number, since it is smaller than the sum of its proper divisors (21269315603564).

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

21221140434004 is a wasteful number, since it uses less digits than its factorization.

21221140434004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860270895 (or 860270893 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 28.

Adding to 21221140434004 its reverse (40043404112212), we get a palindrome (61264544546216).

The spelling of 21221140434004 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred forty million, four hundred thirty-four thousand, four".