216156021 has 8 divisors (see below), whose sum is σ = 292267584. Its totient is φ = 142074240.

The previous prime is 216156011. The next prime is 216156041. The reversal of 216156021 is 120651612.

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

It is not a de Polignac number, because 216156021 - 2⁶ = 216155957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216155982 and 216156000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216156011) 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, 507196 + ... + 507621.

It is an arithmetic number, because the mean of its divisors is an integer number (36533448).

Almost surely, 2^216156021 is an apocalyptic number.

It is an amenable number.

216156021 is a deficient number, since it is larger than the sum of its proper divisors (76111563).

216156021 is a wasteful number, since it uses less digits than its factorization.

216156021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1014891.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 216156021 is about 14702.2454407482. The cubic root of 216156021 is about 600.1444291198.

The spelling of 216156021 in words is "two hundred sixteen million, one hundred fifty-six thousand, twenty-one".