21421433254 has 16 divisors (see below), whose sum is σ = 34616378160. Its totient is φ = 9883236960.

The previous prime is 21421433213. The next prime is 21421433269. The reversal of 21421433254 is 45233412412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75192 + ... + 220219.

It is an arithmetic number, because the mean of its divisors is an integer number (2163523635).

Almost surely, 2^21421433254 is an apocalyptic number.

21421433254 is a deficient number, since it is larger than the sum of its proper divisors (13194944906).

21421433254 is a wasteful number, since it uses less digits than its factorization.

21421433254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298215.

The product of its digits is 23040, while the sum is 31.

Adding to 21421433254 its reverse (45233412412), we get a palindrome (66654845666).

The spelling of 21421433254 in words is "twenty-one billion, four hundred twenty-one million, four hundred thirty-three thousand, two hundred fifty-four".