12122021021 has 4 divisors (see below), whose sum is σ = 13224022944. Its totient is φ = 11020019100.

The previous prime is 12122021017. The next prime is 12122021053. The reversal of 12122021021 is 12012022121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12012022121 = 11 ⋅1092002011.

It is a cyclic number.

It is not a de Polignac number, because 12122021021 - 2² = 12122021017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12122020987 and 12122021005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12122021221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 551000945 + ... + 551000966.

It is an arithmetic number, because the mean of its divisors is an integer number (3306005736).

Almost surely, 2^12122021021 is an apocalyptic number.

12122021021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12122021021 is a deficient number, since it is larger than the sum of its proper divisors (1102001923).

12122021021 is a wasteful number, since it uses less digits than its factorization.

12122021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1102001922.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 12122021021 its reverse (12012022121), we get a palindrome (24134043142).

It can be divided in two parts, 121220 and 21021, that added together give a palindrome (142241).

The spelling of 12122021021 in words is "twelve billion, one hundred twenty-two million, twenty-one thousand, twenty-one".