21021675212474 has 8 divisors (see below), whose sum is σ = 32049439258548. Its totient is φ = 10338528792960.

The previous prime is 21021675212449. The next prime is 21021675212491. The reversal of 21021675212474 is 47421257612012.

It can be written as a sum of positive squares in 2 ways, for example, as 15832878693025 + 5188796519449 = 3979055^2 + 2277893^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86154406487 + ... + 86154406730.

Almost surely, 2^{21021675212474} is an apocalyptic number.

21021675212474 is a deficient number, since it is larger than the sum of its proper divisors (11027764046074).

21021675212474 is a wasteful number, since it uses less digits than its factorization.

21021675212474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172308813280.

The product of its (nonzero) digits is 376320, while the sum is 44.

The spelling of 21021675212474 in words is "twenty-one trillion, twenty-one billion, six hundred seventy-five million, two hundred twelve thousand, four hundred seventy-four".