21612774806 has 16 divisors (see below), whose sum is σ = 37052640000. Its totient is φ = 9262075560.

The previous prime is 21612774761. The next prime is 21612774817. The reversal of 21612774806 is 60847721612.

It is a super-2 number, since 2×21612774806² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 286445 + ... + 353943.

It is an arithmetic number, because the mean of its divisors is an integer number (2315790000).

Almost surely, 2^21612774806 is an apocalyptic number.

21612774806 is a deficient number, since it is larger than the sum of its proper divisors (15439865194).

21612774806 is a wasteful number, since it uses less digits than its factorization.

21612774806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90379.

The product of its (nonzero) digits is 225792, while the sum is 44.

The spelling of 21612774806 in words is "twenty-one billion, six hundred twelve million, seven hundred seventy-four thousand, eight hundred six".