21217006079 has 8 divisors (see below), whose sum is σ = 21331190400. Its totient is φ = 21102897816.

The previous prime is 21217006061. The next prime is 21217006091. The reversal of 21217006079 is 97060071212.

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 21217006079 - 2¹² = 21217001983 is a prime.

It is a super-2 number, since 2×21217006079² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21217005079) 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, 592952 + ... + 627714.

It is an arithmetic number, because the mean of its divisors is an integer number (2666398800).

Almost surely, 2^21217006079 is an apocalyptic number.

21217006079 is a deficient number, since it is larger than the sum of its proper divisors (114184321).

21217006079 is a wasteful number, since it uses less digits than its factorization.

21217006079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38029.

The product of its (nonzero) digits is 10584, while the sum is 35.

The spelling of 21217006079 in words is "twenty-one billion, two hundred seventeen million, six thousand, seventy-nine".