78112021 has 8 divisors (see below), whose sum is σ = 88548320. Its totient is φ = 68308272.

The previous prime is 78112019. The next prime is 78112031. The reversal of 78112021 is 12021187.

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 78112021 - 2¹ = 78112019 is a prime.

It is a super-2 number, since 2×78112021² = 12202975649408882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78111983 and 78112001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78112031) 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, 157875 + ... + 158368.

It is an arithmetic number, because the mean of its divisors is an integer number (11068540).

Almost surely, 2^78112021 is an apocalyptic number.

It is an amenable number.

78112021 is a deficient number, since it is larger than the sum of its proper divisors (10436299).

78112021 is a wasteful number, since it uses less digits than its factorization.

78112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316275.

The product of its (nonzero) digits is 224, while the sum is 22.

The square root of 78112021 is about 8838.1005312228. The cubic root of 78112021 is about 427.4703119951.

The spelling of 78112021 in words is "seventy-eight million, one hundred twelve thousand, twenty-one".