121021210 has 16 divisors (see below), whose sum is σ = 224865792. Its totient is φ = 46846800.

The previous prime is 121021183. The next prime is 121021211. The reversal of 121021210 is 12120121.

It is a super-2 number, since 2×121021210² = 29292266539728200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (121021211) 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, 194886 + ... + 195505.

It is an arithmetic number, because the mean of its divisors is an integer number (14054112).

Almost surely, 2^121021210 is an apocalyptic number.

121021210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121021210 is a deficient number, since it is larger than the sum of its proper divisors (103844582).

121021210 is a wasteful number, since it uses less digits than its factorization.

121021210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390429.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 121021210 is about 11000.9640486641. The cubic root of 121021210 is about 494.6376425027.

Adding to 121021210 its reverse (12120121), we get a palindrome (133141331).

The spelling of 121021210 in words is "one hundred twenty-one million, twenty-one thousand, two hundred ten".