211221121010201 has 4 divisors (see below), whose sum is σ = 211222787720400. Its totient is φ = 211219454300004.

The previous prime is 211221121010197. The next prime is 211221121010293. The reversal of 211221121010201 is 102010121122112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 211221121010201 - 2² = 211221121010197 is a prime.

It is a super-2 number, since 2×211221121010201² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211221121010201.

It is not an unprimeable number, because it can be changed into a prime (211221121030201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 833164991 + ... + 833418468.

It is an arithmetic number, because the mean of its divisors is an integer number (52805696930100).

Almost surely, 2^{211221121010201} is an apocalyptic number.

It is an amenable number.

211221121010201 is a deficient number, since it is larger than the sum of its proper divisors (1666710199).

211221121010201 is a wasteful number, since it uses less digits than its factorization.

211221121010201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1666710198.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 211221121010201 its reverse (102010121122112), we get a palindrome (313231242132313).

The spelling of 211221121010201 in words is "two hundred eleven trillion, two hundred twenty-one billion, one hundred twenty-one million, ten thousand, two hundred one".