1212111200021 has 8 divisors (see below), whose sum is σ = 1251633081600. Its totient is φ = 1172615663520.

The previous prime is 1212111199969. The next prime is 1212111200039. The reversal of 1212111200021 is 1200021112121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212111200021 is a prime.

It is a super-2 number, since 2×1212111200021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1212111199969 and 1212111200005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212111200621) 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, 6492731 + ... + 6676808.

It is an arithmetic number, because the mean of its divisors is an integer number (156454135200).

Almost surely, 2^{1212111200021} is an apocalyptic number.

It is an amenable number.

1212111200021 is a deficient number, since it is larger than the sum of its proper divisors (39521881579).

1212111200021 is a wasteful number, since it uses less digits than its factorization.

1212111200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13172539.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1212111200021 its reverse (1200021112121), we get a palindrome (2412132312142).

The spelling of 1212111200021 in words is "one trillion, two hundred twelve billion, one hundred eleven million, two hundred thousand, twenty-one".