211212000020021 has 64 divisors (see below), whose sum is σ = 288530492221440. Its totient is φ = 149274007453440.

The previous prime is 211212000020017. The next prime is 211212000020057. The reversal of 211212000020021 is 120020000212112.

It is a cyclic number.

It is not a de Polignac number, because 211212000020021 - 2² = 211212000020017 is a prime.

It is a super-2 number, since 2×211212000020021² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211212000019978 and 211212000020005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211212000020221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 122161451 + ... + 123878343.

It is an arithmetic number, because the mean of its divisors is an integer number (4508288940960).

Almost surely, 2^{211212000020021} is an apocalyptic number.

It is an amenable number.

211212000020021 is a deficient number, since it is larger than the sum of its proper divisors (77318492201419).

211212000020021 is a wasteful number, since it uses less digits than its factorization.

211212000020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1719066.

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

Adding to 211212000020021 its reverse (120020000212112), we get a palindrome (331232000232133).

The spelling of 211212000020021 in words is "two hundred eleven trillion, two hundred twelve billion, twenty thousand, twenty-one".