12121122021 has 8 divisors (see below), whose sum is σ = 16162509600. Its totient is φ = 8080241232.

The previous prime is 12121121993. The next prime is 12121122031. The reversal of 12121122021 is 12022112121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12121122021 - 2¹⁴ = 12121105637 is a prime.

It is a super-2 number, since 2×12121122021² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121122031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66850 + ... + 169443.

It is an arithmetic number, because the mean of its divisors is an integer number (2020313700).

Almost surely, 2^12121122021 is an apocalyptic number.

It is an amenable number.

12121122021 is a deficient number, since it is larger than the sum of its proper divisors (4041387579).

12121122021 is a wasteful number, since it uses less digits than its factorization.

12121122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253395.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 12121122021 its reverse (12022112121), we get a palindrome (24143234142).

The spelling of 12121122021 in words is "twelve billion, one hundred twenty-one million, one hundred twenty-two thousand, twenty-one".