121651215 has 64 divisors (see below), whose sum is σ = 230169600. Its totient is φ = 53720064.

The previous prime is 121651193. The next prime is 121651217. The reversal of 121651215 is 512156121.

It is not a de Polignac number, because 121651215 - 2¹¹ = 121649167 is a prime.

It is a super-2 number, since 2×121651215² = 29598036221952450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121651217) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 452101 + ... + 452369.

It is an arithmetic number, because the mean of its divisors is an integer number (3596400).

Almost surely, 2^121651215 is an apocalyptic number.

121651215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121651215 is a deficient number, since it is larger than the sum of its proper divisors (108518385).

121651215 is a wasteful number, since it uses less digits than its factorization.

121651215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416.

The product of its digits is 600, while the sum is 24.

The square root of 121651215 is about 11029.5609613438. The cubic root of 121651215 is about 495.4944757844.

The spelling of 121651215 in words is "one hundred twenty-one million, six hundred fifty-one thousand, two hundred fifteen".