211201112221021 has 16 divisors (see below), whose sum is σ = 228485392640064. Its totient is φ = 194065394586624.

The previous prime is 211201112221019. The next prime is 211201112221051. The reversal of 211201112221021 is 120122211102112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 211201112221021 - 2¹ = 211201112221019 is a prime.

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 211201112221021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211201112221051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13053546 + ... + 24347428.

It is an arithmetic number, because the mean of its divisors is an integer number (14280337040004).

Almost surely, 2^{211201112221021} is an apocalyptic number.

It is an amenable number.

211201112221021 is a deficient number, since it is larger than the sum of its proper divisors (17284280419043).

211201112221021 is a wasteful number, since it uses less digits than its factorization.

211201112221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11300460.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 211201112221021 its reverse (120122211102112), we get a palindrome (331323323323133).

The spelling of 211201112221021 in words is "two hundred eleven trillion, two hundred one billion, one hundred twelve million, two hundred twenty-one thousand, twenty-one".