1212200100021 has 8 divisors (see below), whose sum is σ = 1672000138080. Its totient is φ = 780266730992.

The previous prime is 1212200099993. The next prime is 1212200100037. The reversal of 1212200100021 is 1200010022121.

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

It is a cyclic number.

It is not a de Polignac number, because 1212200100021 - 2¹³ = 1212200091829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212200100821) 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, 6966667155 + ... + 6966667328.

It is an arithmetic number, because the mean of its divisors is an integer number (209000017260).

Almost surely, 2^{1212200100021} is an apocalyptic number.

It is an amenable number.

1212200100021 is a deficient number, since it is larger than the sum of its proper divisors (459800038059).

1212200100021 is a wasteful number, since it uses less digits than its factorization.

1212200100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13933334515.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1212200100021 its reverse (1200010022121), we get a palindrome (2412210122142).

The spelling of 1212200100021 in words is "one trillion, two hundred twelve billion, two hundred million, one hundred thousand, twenty-one".