21043404254 has 8 divisors (see below), whose sum is σ = 31766158488. Its totient is φ = 10454684760.

The previous prime is 21043404251. The next prime is 21043404257. The reversal of 21043404254 is 45240434012.

It is an interprime number because it is at equal distance from previous prime (21043404251) and next prime (21043404257).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21043404251) 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, 33508292 + ... + 33508919.

It is an arithmetic number, because the mean of its divisors is an integer number (3970769811).

Almost surely, 2^21043404254 is an apocalyptic number.

21043404254 is a deficient number, since it is larger than the sum of its proper divisors (10722754234).

21043404254 is a wasteful number, since it uses less digits than its factorization.

21043404254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67017370.

The product of its (nonzero) digits is 15360, while the sum is 29.

Adding to 21043404254 its reverse (45240434012), we get a palindrome (66283838266).

The spelling of 21043404254 in words is "twenty-one billion, forty-three million, four hundred four thousand, two hundred fifty-four".