21423324121444 has 24 divisors (see below), whose sum is σ = 43721069638400. Its totient is φ = 9181424622888.

The previous prime is 21423324121421. The next prime is 21423324121483. The reversal of 21423324121444 is 44412142332412.

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, 7807332492 + ... + 7807335235.

Almost surely, 2^{21423324121444} is an apocalyptic number.

It is an amenable number.

21423324121444 is an abundant number, since it is smaller than the sum of its proper divisors (22297745516956).

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

21423324121444 is a wasteful number, since it uses less digits than its factorization.

21423324121444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15614667752 (or 15614667736 counting only the distinct ones).

The product of its digits is 147456, while the sum is 37.

Adding to 21423324121444 its reverse (44412142332412), we get a palindrome (65835466453856).

The spelling of 21423324121444 in words is "twenty-one trillion, four hundred twenty-three billion, three hundred twenty-four million, one hundred twenty-one thousand, four hundred forty-four".