21451251374 has 8 divisors (see below), whose sum is σ = 36773573808. Its totient is φ = 9193393440.

The previous prime is 21451251361. The next prime is 21451251383. The reversal of 21451251374 is 47315215412.

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, 766116107 + ... + 766116134.

It is an arithmetic number, because the mean of its divisors is an integer number (4596696726).

Almost surely, 2^21451251374 is an apocalyptic number.

21451251374 is a deficient number, since it is larger than the sum of its proper divisors (15322322434).

21451251374 is a wasteful number, since it uses less digits than its factorization.

21451251374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1532232250.

The product of its digits is 33600, while the sum is 35.

Adding to 21451251374 its reverse (47315215412), we get a palindrome (68766466786).

The spelling of 21451251374 in words is "twenty-one billion, four hundred fifty-one million, two hundred fifty-one thousand, three hundred seventy-four".