21304042423422 has 32 divisors (see below), whose sum is σ = 46486052181504. Its totient is φ = 6455144726400.

The previous prime is 21304042423387. The next prime is 21304042423427. The reversal of 21304042423422 is 22432424040312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21304042423427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14956278 + ... + 16318649.

It is an arithmetic number, because the mean of its divisors is an integer number (1452689130672).

Almost surely, 2^{21304042423422} is an apocalyptic number.

21304042423422 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21304042423422 is an abundant number, since it is smaller than the sum of its proper divisors (25182009758082).

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

21304042423422 is a wasteful number, since it uses less digits than its factorization.

21304042423422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31285264.

The product of its (nonzero) digits is 73728, while the sum is 33.

Adding to 21304042423422 its reverse (22432424040312), we get a palindrome (43736466463734).

The spelling of 21304042423422 in words is "twenty-one trillion, three hundred four billion, forty-two million, four hundred twenty-three thousand, four hundred twenty-two".