216015051 has 16 divisors (see below), whose sum is σ = 329375744. Its totient is φ = 123358464.

The previous prime is 216015049. The next prime is 216015061. The reversal of 216015051 is 150510612.

It is not a de Polignac number, because 216015051 - 2¹ = 216015049 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216015061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52470 + ... + 56436.

It is an arithmetic number, because the mean of its divisors is an integer number (20585984).

Almost surely, 2^216015051 is an apocalyptic number.

216015051 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

216015051 is a deficient number, since it is larger than the sum of its proper divisors (113360693).

216015051 is a wasteful number, since it uses less digits than its factorization.

216015051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6570.

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 216015051 is about 14697.4504931978. The cubic root of 216015051 is about 600.0139357874.

Adding to 216015051 its reverse (150510612), we get a palindrome (366525663).

The spelling of 216015051 in words is "two hundred sixteen million, fifteen thousand, fifty-one".