121021011 has 24 divisors (see below), whose sum is σ = 188139744. Its totient is φ = 74684160.

The previous prime is 121021007. The next prime is 121021037. The reversal of 121021011 is 110120121.

It is a happy number.

It is not a de Polignac number, because 121021011 - 2² = 121021007 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 = 121020984 and 121021002.

It is not an unprimeable number, because it can be changed into a prime (121021091) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2850 + ... + 15816.

It is an arithmetic number, because the mean of its divisors is an integer number (7839156).

Almost surely, 2^121021011 is an apocalyptic number.

121021011 is a deficient number, since it is larger than the sum of its proper divisors (67118733).

121021011 is a wasteful number, since it uses less digits than its factorization.

121021011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13051 (or 13048 counting only the distinct ones).

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

The square root of 121021011 is about 11000.9550039985. The cubic root of 121021011 is about 494.6373713851.

Adding to 121021011 its reverse (110120121), we get a palindrome (231141132).

The spelling of 121021011 in words is "one hundred twenty-one million, twenty-one thousand, eleven".