210211021201021 has 4 divisors (see below), whose sum is σ = 210211231124412. Its totient is φ = 210210811277632.

The previous prime is 210211021201019. The next prime is 210211021201063. The reversal of 210211021201021 is 120102120112012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 134102653272900 + 76108367928121 = 11580270^2 + 8724011^2 .

It is a cyclic number.

It is not a de Polignac number, because 210211021201021 - 2¹ = 210211021201019 is a prime.

It is a super-2 number, since 2×210211021201021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210211021200986 and 210211021201004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210211021201921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103452406 + ... + 105464791.

It is an arithmetic number, because the mean of its divisors is an integer number (52552807781103).

Almost surely, 2^{210211021201021} is an apocalyptic number.

It is an amenable number.

210211021201021 is a deficient number, since it is larger than the sum of its proper divisors (209923391).

210211021201021 is a wasteful number, since it uses less digits than its factorization.

210211021201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209923390.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 210211021201021 its reverse (120102120112012), we get a palindrome (330313141313033).

The spelling of 210211021201021 in words is "two hundred ten trillion, two hundred eleven billion, twenty-one million, two hundred one thousand, twenty-one".