21430451254 has 8 divisors (see below), whose sum is σ = 32158435608. Its totient is φ = 10710972720.

The previous prime is 21430451201. The next prime is 21430451267. The reversal of 21430451254 is 45215403412.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2120152 + ... + 2130235.

It is an arithmetic number, because the mean of its divisors is an integer number (4019804451).

Almost surely, 2^21430451254 is an apocalyptic number.

21430451254 is a deficient number, since it is larger than the sum of its proper divisors (10727984354).

21430451254 is a wasteful number, since it uses less digits than its factorization.

21430451254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4252910.

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 21430451254 its reverse (45215403412), we get a palindrome (66645854666).

The spelling of 21430451254 in words is "twenty-one billion, four hundred thirty million, four hundred fifty-one thousand, two hundred fifty-four".