121101210 has 64 divisors (see below), whose sum is σ = 336994560. Its totient is φ = 30888000.

The previous prime is 121101203. The next prime is 121101229. The reversal of 121101210 is 12101121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 121101192 and 121101201.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3541 + ... + 15960.

It is an arithmetic number, because the mean of its divisors is an integer number (5265540).

Almost surely, 2^121101210 is an apocalyptic number.

121101210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121101210 is an abundant number, since it is smaller than the sum of its proper divisors (215893350).

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

121101210 is a wasteful number, since it uses less digits than its factorization.

121101210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19540 (or 19534 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 121101210 is about 11004.5994929393. The cubic root of 121101210 is about 494.7466104411.

Adding to 121101210 its reverse (12101121), we get a palindrome (133202331).

The spelling of 121101210 in words is "one hundred twenty-one million, one hundred one thousand, two hundred ten".