121210101 has 32 divisors (see below), whose sum is σ = 191420800. Its totient is φ = 76527504.

The previous prime is 121210081. The next prime is 121210157. The reversal of 121210101 is 101012121.

It is a happy number.

121210101 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is not a de Polignac number, because 121210101 - 2¹⁷ = 121079029 is a prime.

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

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121210181) 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, 40095 + ... + 43011.

It is an arithmetic number, because the mean of its divisors is an integer number (5981900).

Almost surely, 2^121210101 is an apocalyptic number.

It is an amenable number.

121210101 is a deficient number, since it is larger than the sum of its proper divisors (70210699).

121210101 is an frugal number, since it uses more digits than its factorization.

121210101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2957 (or 2939 counting only the distinct ones).

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

The square root of 121210101 is about 11009.5459034422. The cubic root of 121210101 is about 494.8948536998.

Adding to 121210101 its reverse (101012121), we get a palindrome (222222222).

The spelling of 121210101 in words is "one hundred twenty-one million, two hundred ten thousand, one hundred one".