211221110100121 has 8 divisors (see below), whose sum is σ = 235325646843264. Its totient is φ = 187933676297520.

The previous prime is 211221110100113. The next prime is 211221110100127. The reversal of 211221110100121 is 121001011122112.

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 211221110100121 - 2³ = 211221110100113 is a prime.

It is a super-2 number, since 2×211221110100121² (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 = 211221110100095 and 211221110100104.

It is not an unprimeable number, because it can be changed into a prime (211221110100127) 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, 204275734590 + ... + 204275735623.

It is an arithmetic number, because the mean of its divisors is an integer number (29415705855408).

Almost surely, 2^{211221110100121} is an apocalyptic number.

It is an amenable number.

211221110100121 is a deficient number, since it is larger than the sum of its proper divisors (24104536743143).

211221110100121 is a wasteful number, since it uses less digits than its factorization.

211221110100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408551470271.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 211221110100121 its reverse (121001011122112), we get a palindrome (332222121222233).

The spelling of 211221110100121 in words is "two hundred eleven trillion, two hundred twenty-one billion, one hundred ten million, one hundred thousand, one hundred twenty-one".