216720051 has 8 divisors (see below), whose sum is σ = 289077504. Its totient is φ = 144421320.

The previous prime is 216720037. The next prime is 216720067. The reversal of 216720051 is 150027612.

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

It is not a de Polignac number, because 216720051 - 2²¹ = 214622899 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216720001) 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, 5191 + ... + 21456.

It is an arithmetic number, because the mean of its divisors is an integer number (36134688).

Almost surely, 2^216720051 is an apocalyptic number.

216720051 is a deficient number, since it is larger than the sum of its proper divisors (72357453).

216720051 is a wasteful number, since it uses less digits than its factorization.

216720051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29361.

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 216720051 is about 14721.4147078329. The cubic root of 216720051 is about 600.6659744122.

Adding to 216720051 its reverse (150027612), we get a palindrome (366747663).

The spelling of 216720051 in words is "two hundred sixteen million, seven hundred twenty thousand, fifty-one".