21077036018 has 8 divisors (see below), whose sum is σ = 31619402220. Its totient is φ = 10537235280.

The previous prime is 21077036003. The next prime is 21077036023. The reversal of 21077036018 is 81063077012.

It can be written as a sum of positive squares in 2 ways, for example, as 15156810769 + 5920225249 = 123113^2 + 76943^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 620693 + ... + 653768.

Almost surely, 2^21077036018 is an apocalyptic number.

21077036018 is a deficient number, since it is larger than the sum of its proper divisors (10542366202).

21077036018 is a wasteful number, since it uses less digits than its factorization.

21077036018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1282732.

The product of its (nonzero) digits is 14112, while the sum is 35.

The spelling of 21077036018 in words is "twenty-one billion, seventy-seven million, thirty-six thousand, eighteen".