21226634574 has 8 divisors (see below), whose sum is σ = 42453269160. Its totient is φ = 7075544856.

The previous prime is 21226634563. The next prime is 21226634587. The reversal of 21226634574 is 47543662212.

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

21226634574 is an admirable number.

It is a super-2 number, since 2×21226634574² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 1768886209 + ... + 1768886220.

It is an arithmetic number, because the mean of its divisors is an integer number (5306658645).

Almost surely, 2^21226634574 is an apocalyptic number.

21226634574 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21226634574 is a wasteful number, since it uses less digits than its factorization.

21226634574 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3537772434.

The product of its digits is 483840, while the sum is 42.

The spelling of 21226634574 in words is "twenty-one billion, two hundred twenty-six million, six hundred thirty-four thousand, five hundred seventy-four".