1212210200021 has 4 divisors (see below), whose sum is σ = 1232082498444. Its totient is φ = 1192337901600.

The previous prime is 1212210200011. The next prime is 1212210200023. The reversal of 1212210200021 is 1200020122121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 416476622500 + 795733577521 = 645350^2 + 892039^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212210200021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212210199969 and 1212210200005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212210200023) 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, 9936149120 + ... + 9936149241.

It is an arithmetic number, because the mean of its divisors is an integer number (308020624611).

Almost surely, 2^{1212210200021} is an apocalyptic number.

It is an amenable number.

1212210200021 is a deficient number, since it is larger than the sum of its proper divisors (19872298423).

1212210200021 is an equidigital number, since it uses as much as digits as its factorization.

1212210200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19872298422.

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

Adding to 1212210200021 its reverse (1200020122121), we get a palindrome (2412230322142).

The spelling of 1212210200021 in words is "one trillion, two hundred twelve billion, two hundred ten million, two hundred thousand, twenty-one".