216072121 has 8 divisors (see below), whose sum is σ = 217413504. Its totient is φ = 214735200.

The previous prime is 216072107. The next prime is 216072133. The reversal of 216072121 is 121270612.

It is a happy number.

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 216072121 - 2⁵ = 216072089 is a prime.

It is a super-2 number, since 2×216072121² = 93374322946877282, 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 = 216072092 and 216072101.

It is not an unprimeable number, because it can be changed into a prime (216072191) 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, 157380 + ... + 158746.

It is an arithmetic number, because the mean of its divisors is an integer number (27176688).

Almost surely, 2^216072121 is an apocalyptic number.

It is an amenable number.

216072121 is a deficient number, since it is larger than the sum of its proper divisors (1341383).

216072121 is a wasteful number, since it uses less digits than its factorization.

216072121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2231.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 216072121 is about 14699.3918581688. The cubic root of 216072121 is about 600.0667712728.

The spelling of 216072121 in words is "two hundred sixteen million, seventy-two thousand, one hundred twenty-one".