211212120022221 has 8 divisors (see below), whose sum is σ = 281667918213504. Its totient is φ = 140782200922880.

The previous prime is 211212120022219. The next prime is 211212120022303. The reversal of 211212120022221 is 122220021212112.

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 211212120022221 - 2¹ = 211212120022219 is a prime.

It is a super-2 number, since 2×211212120022221² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211212120022921) 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, 6469753941 + ... + 6469786586.

It is an arithmetic number, because the mean of its divisors is an integer number (35208489776688).

Almost surely, 2^{211212120022221} is an apocalyptic number.

It is an amenable number.

211212120022221 is a deficient number, since it is larger than the sum of its proper divisors (70455798191283).

211212120022221 is a wasteful number, since it uses less digits than its factorization.

211212120022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12939545971.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 211212120022221 its reverse (122220021212112), we get a palindrome (333432141234333).

The spelling of 211212120022221 in words is "two hundred eleven trillion, two hundred twelve billion, one hundred twenty million, twenty-two thousand, two hundred twenty-one".