121210011 has 18 divisors (see below), whose sum is σ = 189587268. Its totient is φ = 74589840.

The previous prime is 121210007. The next prime is 121210021. The reversal of 121210011 is 110012121.

It is a happy number.

It is not a de Polignac number, because 121210011 - 2² = 121210007 is a prime.

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 = 121209975 and 121210002.

It is not an unprimeable number, because it can be changed into a prime (121210021) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 38325 + ... + 41366.

It is an arithmetic number, because the mean of its divisors is an integer number (10532626).

Almost surely, 2^121210011 is an apocalyptic number.

121210011 is a deficient number, since it is larger than the sum of its proper divisors (68377257).

121210011 is a wasteful number, since it uses less digits than its factorization.

121210011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79723 (or 79707 counting only the distinct ones).

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

The square root of 121210011 is about 11009.5418160794. The cubic root of 121210011 is about 494.8947312113.

Adding to 121210011 its reverse (110012121), we get a palindrome (231222132).

The spelling of 121210011 in words is "one hundred twenty-one million, two hundred ten thousand, eleven".