78020010221 has 8 divisors (see below), whose sum is σ = 79303629600. Its totient is φ = 76736539440.

The previous prime is 78020010179. The next prime is 78020010223. The reversal of 78020010221 is 12201002087.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78020010221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78020010223) 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, 1634390 + ... + 1681448.

It is an arithmetic number, because the mean of its divisors is an integer number (9912953700).

Almost surely, 2^78020010221 is an apocalyptic number.

It is an amenable number.

78020010221 is a deficient number, since it is larger than the sum of its proper divisors (1283619379).

78020010221 is a wasteful number, since it uses less digits than its factorization.

78020010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74299.

The product of its (nonzero) digits is 448, while the sum is 23.

The spelling of 78020010221 in words is "seventy-eight billion, twenty million, ten thousand, two hundred twenty-one".