211201101222221 has 8 divisors (see below), whose sum is σ = 230417564061888. Its totient is φ = 191987365504000.

The previous prime is 211201101222211. The next prime is 211201101222233. The reversal of 211201101222221 is 122222101102112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 211201101222221 - 2¹⁰ = 211201101221197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211201101222193 and 211201101222202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211201101222211) 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, 681618425 + ... + 681928206.

It is an arithmetic number, because the mean of its divisors is an integer number (28802195507736).

Almost surely, 2^{211201101222221} is an apocalyptic number.

It is an amenable number.

211201101222221 is a deficient number, since it is larger than the sum of its proper divisors (19216462839667).

211201101222221 is a wasteful number, since it uses less digits than its factorization.

211201101222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1363560723.

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

Adding to 211201101222221 its reverse (122222101102112), we get a palindrome (333423202324333).

The spelling of 211201101222221 in words is "two hundred eleven trillion, two hundred one billion, one hundred one million, two hundred twenty-two thousand, two hundred twenty-one".