211221102021 has 16 divisors (see below), whose sum is σ = 289721062848. Its totient is φ = 136780272000.

The previous prime is 211221102017. The next prime is 211221102067. The reversal of 211221102021 is 120201122112.

211221102021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 211221102021 - 2² = 211221102017 is a prime.

It is a super-2 number, since 2×211221102021² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211221102221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1516395 + ... + 1649816.

It is an arithmetic number, because the mean of its divisors is an integer number (18107566428).

Almost surely, 2^211221102021 is an apocalyptic number.

It is an amenable number.

211221102021 is a deficient number, since it is larger than the sum of its proper divisors (78499960827).

211221102021 is a wasteful number, since it uses less digits than its factorization.

211221102021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3166852.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 211221102021 its reverse (120201122112), we get a palindrome (331422224133).

The spelling of 211221102021 in words is "two hundred eleven billion, two hundred twenty-one million, one hundred two thousand, twenty-one".