121131210021 has 32 divisors (see below), whose sum is σ = 163101427200. Its totient is φ = 79962992640.

The previous prime is 121131209977. The next prime is 121131210077. The reversal of 121131210021 is 120012131121.

It is not a de Polignac number, because 121131210021 - 2⁶ = 121131209957 is a prime.

It is a super-3 number, since 3×121131210021³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121131214021) 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, 170847615 + ... + 170848323.

It is an arithmetic number, because the mean of its divisors is an integer number (5096919600).

Almost surely, 2^121131210021 is an apocalyptic number.

It is an amenable number.

121131210021 is a deficient number, since it is larger than the sum of its proper divisors (41970217179).

121131210021 is a wasteful number, since it uses less digits than its factorization.

121131210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1949.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 121131210021 its reverse (120012131121), we get a palindrome (241143341142).

The spelling of 121131210021 in words is "one hundred twenty-one billion, one hundred thirty-one million, two hundred ten thousand, twenty-one".