121213210 has 8 divisors (see below), whose sum is σ = 218183796. Its totient is φ = 48485280.

The previous prime is 121213201. The next prime is 121213219. The reversal of 121213210 is 12312121.

It is an interprime number because it is at equal distance from previous prime (121213201) and next prime (121213219).

It can be written as a sum of positive squares in 2 ways, for example, as 121198081 + 15129 = 11009^2 + 123^2 .

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

It is not an unprimeable number, because it can be changed into a prime (121213219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6060651 + ... + 6060670.

Almost surely, 2^121213210 is an apocalyptic number.

121213210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121213210 is a deficient number, since it is larger than the sum of its proper divisors (96970586).

121213210 is a wasteful number, since it uses less digits than its factorization.

121213210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12121328.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 121213210 is about 11009.6870981877. The cubic root of 121213210 is about 494.8990849614.

Adding to 121213210 its reverse (12312121), we get a palindrome (133525331).

The spelling of 121213210 in words is "one hundred twenty-one million, two hundred thirteen thousand, two hundred ten".