1211212200021 has 32 divisors (see below), whose sum is σ = 1676430606336. Its totient is φ = 777030840000.

The previous prime is 1211212199993. The next prime is 1211212200049. The reversal of 1211212200021 is 1200022121121.

It is an interprime number because it is at equal distance from previous prime (1211212199993) and next prime (1211212200049).

It is not a de Polignac number, because 1211212200021 - 2¹³ = 1211212191829 is a prime.

It is a super-3 number, since 3×1211212200021³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211212208021) 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, 50630355 + ... + 50654271.

It is an arithmetic number, because the mean of its divisors is an integer number (52388456448).

Almost surely, 2^{1211212200021} is an apocalyptic number.

It is an amenable number.

1211212200021 is a deficient number, since it is larger than the sum of its proper divisors (465218406315).

1211212200021 is a wasteful number, since it uses less digits than its factorization.

1211212200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26993.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1211212200021 its reverse (1200022121121), we get a palindrome (2411234321142).

The spelling of 1211212200021 in words is "one trillion, two hundred eleven billion, two hundred twelve million, two hundred thousand, twenty-one".