115212021 has 8 divisors (see below), whose sum is σ = 153694464. Its totient is φ = 76768800.

The previous prime is 115212017. The next prime is 115212023. The reversal of 115212021 is 120212511.

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

It is not a de Polignac number, because 115212021 - 2² = 115212017 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115212023) 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, 2080 + ... + 15321.

It is an arithmetic number, because the mean of its divisors is an integer number (19211808).

Almost surely, 2^115212021 is an apocalyptic number.

It is an amenable number.

115212021 is a deficient number, since it is larger than the sum of its proper divisors (38482443).

115212021 is a wasteful number, since it uses less digits than its factorization.

115212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19611.

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 115212021 is about 10733.6862726651. The cubic root of 115212021 is about 486.5930836290.

Adding to 115212021 its reverse (120212511), we get a palindrome (235424532).

The spelling of 115212021 in words is "one hundred fifteen million, two hundred twelve thousand, twenty-one".