211220212210121 has 8 divisors (see below), whose sum is σ = 211341534877440. Its totient is φ = 211098890958768.

The previous prime is 211220212210087. The next prime is 211220212210193. The reversal of 211220212210121 is 121012212022112.

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 211220212210121 - 2¹⁴ = 211220212193737 is a prime.

It is a super-2 number, since 2×211220212210121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211220212210093 and 211220212210102.

It is not an unprimeable number, because it can be changed into a prime (211220212210421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 501503795 + ... + 501924791.

It is an arithmetic number, because the mean of its divisors is an integer number (26417691859680).

Almost surely, 2^{211220212210121} is an apocalyptic number.

It is an amenable number.

211220212210121 is a deficient number, since it is larger than the sum of its proper divisors (121322667319).

211220212210121 is a wasteful number, since it uses less digits than its factorization.

211220212210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707983.

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

Adding to 211220212210121 its reverse (121012212022112), we get a palindrome (332232424232233).

The spelling of 211220212210121 in words is "two hundred eleven trillion, two hundred twenty billion, two hundred twelve million, two hundred ten thousand, one hundred twenty-one".