21616690067 has 8 divisors (see below), whose sum is σ = 25002437376. Its totient is φ = 18305354952.

The previous prime is 21616690061. The next prime is 21616690091. The reversal of 21616690067 is 76009661612.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21616690067 - 2⁸ = 21616689811 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21616690061) 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, 18602423 + ... + 18603584.

It is an arithmetic number, because the mean of its divisors is an integer number (3125304672).

Almost surely, 2^21616690067 is an apocalyptic number.

21616690067 is a deficient number, since it is larger than the sum of its proper divisors (3385747309).

21616690067 is an equidigital number, since it uses as much as digits as its factorization.

21616690067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37206097.

The product of its (nonzero) digits is 163296, while the sum is 44.

The spelling of 21616690067 in words is "twenty-one billion, six hundred sixteen million, six hundred ninety thousand, sixty-seven".