21677204642 has 8 divisors (see below), whose sum is σ = 32529102336. Its totient is φ = 10834170532.

The previous prime is 21677204641. The next prime is 21677204701. The reversal of 21677204642 is 24640277612.

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

It is a super-2 number, since 2×21677204642² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21677204642.

It is not an unprimeable number, because it can be changed into a prime (21677204641) 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, 2209778 + ... + 2219565.

It is an arithmetic number, because the mean of its divisors is an integer number (4066137792).

Almost surely, 2^21677204642 is an apocalyptic number.

21677204642 is a deficient number, since it is larger than the sum of its proper divisors (10851897694).

21677204642 is a wasteful number, since it uses less digits than its factorization.

21677204642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4431792.

The product of its (nonzero) digits is 225792, while the sum is 41.

The spelling of 21677204642 in words is "twenty-one billion, six hundred seventy-seven million, two hundred four thousand, six hundred forty-two".