212120251 has 16 divisors (see below), whose sum is σ = 245260224. Its totient is φ = 179702784.

The previous prime is 212120243. The next prime is 212120263. The reversal of 212120251 is 152021212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 212120251 - 2³ = 212120243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212120201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 357411 + ... + 358003.

It is an arithmetic number, because the mean of its divisors is an integer number (15328764).

Almost surely, 2^212120251 is an apocalyptic number.

212120251 is a deficient number, since it is larger than the sum of its proper divisors (33139973).

212120251 is a wasteful number, since it uses less digits than its factorization.

212120251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1110.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 212120251 is about 14564.3486294444. The cubic root of 212120251 is about 596.3859141632.

Adding to 212120251 its reverse (152021212), we get a palindrome (364141463).

The spelling of 212120251 in words is "two hundred twelve million, one hundred twenty thousand, two hundred fifty-one".