21247622884546 has 8 divisors (see below), whose sum is σ = 31871493238284. Its totient is φ = 10623791805120.

The previous prime is 21247622884493. The next prime is 21247622884573. The reversal of 21247622884546 is 64548822674212.

It can be written as a sum of positive squares in 2 ways, for example, as 20831565633921 + 416057250625 = 4564161^2 + 645025^2 .

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

It is a super-2 number, since 2×21247622884546² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8426595 + ... + 10653766.

Almost surely, 2^{21247622884546} is an apocalyptic number.

21247622884546 is a deficient number, since it is larger than the sum of its proper divisors (10623870353738).

21247622884546 is a wasteful number, since it uses less digits than its factorization.

21247622884546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19637156.

The product of its digits is 82575360, while the sum is 61.

The spelling of 21247622884546 in words is "twenty-one trillion, two hundred forty-seven billion, six hundred twenty-two million, eight hundred eighty-four thousand, five hundred forty-six".