211212111020021 has 4 divisors (see below), whose sum is σ = 214364530587552. Its totient is φ = 208059691452492.

The previous prime is 211212111020003. The next prime is 211212111020077. The reversal of 211212111020021 is 120020111212112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 211212111020021 - 2³⁸ = 210937233113077 is a prime.

It is a super-3 number, since 3×211212111020021³ (a number of 44 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211212111020221) 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, 1576209783665 + ... + 1576209783798.

It is an arithmetic number, because the mean of its divisors is an integer number (53591132646888).

Almost surely, 2^{211212111020021} is an apocalyptic number.

It is an amenable number.

211212111020021 is a deficient number, since it is larger than the sum of its proper divisors (3152419567531).

211212111020021 is an equidigital number, since it uses as much as digits as its factorization.

211212111020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3152419567530.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 211212111020021 its reverse (120020111212112), we get a palindrome (331232222232133).

The spelling of 211212111020021 in words is "two hundred eleven trillion, two hundred twelve billion, one hundred eleven million, twenty thousand, twenty-one".