21297885274 has 8 divisors (see below), whose sum is σ = 31990413780. Its totient is φ = 10634414016.

The previous prime is 21297885263. The next prime is 21297885281. The reversal of 21297885274 is 47258879212.

It can be written as a sum of positive squares in 2 ways, for example, as 18606869649 + 2691015625 = 136407^2 + 51875^2 .

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

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, 7262479 + ... + 7265410.

Almost surely, 2^21297885274 is an apocalyptic number.

21297885274 is a deficient number, since it is larger than the sum of its proper divisors (10692528506).

21297885274 is a wasteful number, since it uses less digits than its factorization.

21297885274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14528624.

The product of its digits is 4515840, while the sum is 55.

The spelling of 21297885274 in words is "twenty-one billion, two hundred ninety-seven million, eight hundred eighty-five thousand, two hundred seventy-four".