121240210 has 64 divisors (see below), whose sum is σ = 274176000. Its totient is φ = 38356416.

The previous prime is 121240193. The next prime is 121240211. The reversal of 121240210 is 12042121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is not an unprimeable number, because it can be changed into a prime (121240211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43231 + ... + 45949.

It is an arithmetic number, because the mean of its divisors is an integer number (4284000).

Almost surely, 2^121240210 is an apocalyptic number.

121240210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121240210 is an abundant number, since it is smaller than the sum of its proper divisors (152935790).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121240210 is a wasteful number, since it uses less digits than its factorization.

121240210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2760 (or 2746 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 121240210 is about 11010.9132227986. The cubic root of 121240210 is about 494.9358281604.

Adding to 121240210 its reverse (12042121), we get a palindrome (133282331).

The spelling of 121240210 in words is "one hundred twenty-one million, two hundred forty thousand, two hundred ten".