21442775667 has 8 divisors (see below), whose sum is σ = 28591049424. Its totient is φ = 14294842848.

The previous prime is 21442775659. The next prime is 21442775677. The reversal of 21442775667 is 76657724412.

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

It is not a de Polignac number, because 21442775667 - 2³ = 21442775659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21442775617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175213 + ... + 271265.

It is an arithmetic number, because the mean of its divisors is an integer number (3573881178).

Almost surely, 2^21442775667 is an apocalyptic number.

21442775667 is a deficient number, since it is larger than the sum of its proper divisors (7148273757).

21442775667 is an equidigital number, since it uses as much as digits as its factorization.

21442775667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170469.

The product of its digits is 3951360, while the sum is 51.

The spelling of 21442775667 in words is "twenty-one billion, four hundred forty-two million, seven hundred seventy-five thousand, six hundred sixty-seven".