210211222101021 has 6 divisors (see below), whose sum is σ = 303638431923710. Its totient is φ = 140140814734008.

The previous prime is 210211222100987. The next prime is 210211222101061. The reversal of 210211222101021 is 120101222112012.

210211222101021 is a `hidden beast` number, since 210 + 21 + 122 + 210 + 102 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 133495170188121 + 76716051912900 = 11554011^2 + 8758770^2 .

It is not a de Polignac number, because 210211222101021 - 2¹⁷ = 210211221969949 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 210211222100985 and 210211222101003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210211222101061) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11678401227826 + ... + 11678401227843.

Almost surely, 2^{210211222101021} is an apocalyptic number.

It is an amenable number.

210211222101021 is a deficient number, since it is larger than the sum of its proper divisors (93427209822689).

210211222101021 is a wasteful number, since it uses less digits than its factorization.

210211222101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23356802455675 (or 23356802455672 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 210211222101021 its reverse (120101222112012), we get a palindrome (330312444213033).

The spelling of 210211222101021 in words is "two hundred ten trillion, two hundred eleven billion, two hundred twenty-two million, one hundred one thousand, twenty-one".