16121015 has 16 divisors (see below), whose sum is σ = 20723040. Its totient is φ = 11996160.

The previous prime is 16120967. The next prime is 16121029. The reversal of 16121015 is 51012161.

It is not a de Polignac number, because 16121015 - 2²⁰ = 15072439 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a junction number, because it is equal to n+sod(n) for n = 16120984 and 16121002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6500 + ... + 8630.

It is an arithmetic number, because the mean of its divisors is an integer number (1295190).

Almost surely, 2^16121015 is an apocalyptic number.

16121015 is a deficient number, since it is larger than the sum of its proper divisors (4602025).

16121015 is a wasteful number, since it uses less digits than its factorization.

16121015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2242.

The product of its (nonzero) digits is 60, while the sum is 17.

The square root of 16121015 is about 4015.0983798657. The cubic root of 16121015 is about 252.6179039602.

Adding to 16121015 its reverse (51012161), we get a palindrome (67133176).

The spelling of 16121015 in words is "sixteen million, one hundred twenty-one thousand, fifteen".