21402204423044 has 12 divisors (see below), whose sum is σ = 37485842255568. Its totient is φ = 10691963778600.

The previous prime is 21402204423043. The next prime is 21402204423163. The reversal of 21402204423044 is 44032440220412.

It is a self number, because there is not a number n which added to its sum of digits gives 21402204423044.

It is not an unprimeable number, because it can be changed into a prime (21402204423043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2284602962 + ... + 2284612329.

It is an arithmetic number, because the mean of its divisors is an integer number (3123820187964).

Almost surely, 2^{21402204423044} is an apocalyptic number.

It is an amenable number.

21402204423044 is a deficient number, since it is larger than the sum of its proper divisors (16083637832524).

21402204423044 is a wasteful number, since it uses less digits than its factorization.

21402204423044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4569216466 (or 4569216464 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 32.

Adding to 21402204423044 its reverse (44032440220412), we get a palindrome (65434644643456).

The spelling of 21402204423044 in words is "twenty-one trillion, four hundred two billion, two hundred four million, four hundred twenty-three thousand, forty-four".