12102020021 has 32 divisors (see below), whose sum is σ = 15116586240. Its totient is φ = 9433552896.

The previous prime is 12102020003. The next prime is 12102020023. The reversal of 12102020021 is 12002020121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12102020021 - 2¹⁴ = 12102003637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12102019984 and 12102020011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12102020023) 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, 2018390 + ... + 2024376.

It is an arithmetic number, because the mean of its divisors is an integer number (472393320).

Almost surely, 2^12102020021 is an apocalyptic number.

It is an amenable number.

12102020021 is a deficient number, since it is larger than the sum of its proper divisors (3014566219).

12102020021 is a wasteful number, since it uses less digits than its factorization.

12102020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6333.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 12102020021 its reverse (12002020121), we get a palindrome (24104040142).

The spelling of 12102020021 in words is "twelve billion, one hundred two million, twenty thousand, twenty-one".