21004200254 has 16 divisors (see below), whose sum is σ = 32997473280. Its totient is φ = 10008412920.

The previous prime is 21004200251. The next prime is 21004200289. The reversal of 21004200254 is 45200240012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21004200251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 829994 + ... + 854925.

It is an arithmetic number, because the mean of its divisors is an integer number (2062342080).

Almost surely, 2^21004200254 is an apocalyptic number.

21004200254 is a deficient number, since it is larger than the sum of its proper divisors (11993273026).

21004200254 is a wasteful number, since it uses less digits than its factorization.

21004200254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1685215.

The product of its (nonzero) digits is 640, while the sum is 20.

Adding to 21004200254 its reverse (45200240012), we get a palindrome (66204440266).

The spelling of 21004200254 in words is "twenty-one billion, four million, two hundred thousand, two hundred fifty-four".