21612640773574 has 8 divisors (see below), whose sum is σ = 32418983701440. Its totient is φ = 10806312873096.

The previous prime is 21612640773571. The next prime is 21612640773583. The reversal of 21612640773574 is 47537704621612.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21612640773571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1088587 + ... + 6664105.

It is an arithmetic number, because the mean of its divisors is an integer number (4052372962680).

Almost surely, 2^{21612640773574} is an apocalyptic number.

21612640773574 is a deficient number, since it is larger than the sum of its proper divisors (10806342927866).

21612640773574 is a wasteful number, since it uses less digits than its factorization.

21612640773574 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7513694.

The product of its (nonzero) digits is 11854080, while the sum is 55.

The spelling of 21612640773574 in words is "twenty-one trillion, six hundred twelve billion, six hundred forty million, seven hundred seventy-three thousand, five hundred seventy-four".