211221212220101 has 8 divisors (see below), whose sum is σ = 218035392407808. Its totient is φ = 204407069076000.

The previous prime is 211221212219989. The next prime is 211221212220121. The reversal of 211221212220101 is 101022212122112.

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 211221212220101 - 2³⁰ = 211220138478277 is a prime.

It is a super-2 number, since 2×211221212220101² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211221212220121) 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, 2566766 + ... + 20713056.

It is an arithmetic number, because the mean of its divisors is an integer number (27254424050976).

Almost surely, 2^{211221212220101} is an apocalyptic number.

It is an amenable number.

211221212220101 is a deficient number, since it is larger than the sum of its proper divisors (6814180187707).

211221212220101 is a wasteful number, since it uses less digits than its factorization.

211221212220101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18521803.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 211221212220101 its reverse (101022212122112), we get a palindrome (312243424342213).

The spelling of 211221212220101 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred twelve million, two hundred twenty thousand, one hundred one".