16721252215 has 8 divisors (see below), whose sum is σ = 20098027440. Its totient is φ = 13355318592.

The previous prime is 16721252213. The next prime is 16721252237. The reversal of 16721252215 is 51225212761.

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 16721252215 - 2¹ = 16721252213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16721252213) 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, 2707005 + ... + 2713174.

It is an arithmetic number, because the mean of its divisors is an integer number (2512253430).

Almost surely, 2^16721252215 is an apocalyptic number.

16721252215 is a deficient number, since it is larger than the sum of its proper divisors (3376775225).

16721252215 is an equidigital number, since it uses as much as digits as its factorization.

16721252215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5420801.

The product of its digits is 16800, while the sum is 34.

Adding to 16721252215 its reverse (51225212761), we get a palindrome (67946464976).

The spelling of 16721252215 in words is "sixteen billion, seven hundred twenty-one million, two hundred fifty-two thousand, two hundred fifteen".