210012211021 has 4 divisors (see below), whose sum is σ = 210200226652. Its totient is φ = 209824195392.

The previous prime is 210012210979. The next prime is 210012211061. The reversal of 210012211021 is 120112210012.

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 4517721796 + 205494489225 = 67214^2 + 453315^2 .

It is a cyclic number.

It is not a de Polignac number, because 210012211021 - 2²¹ = 210010113869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210012210992 and 210012211010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210012211061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94006140 + ... + 94008373.

It is an arithmetic number, because the mean of its divisors is an integer number (52550056663).

Almost surely, 2^210012211021 is an apocalyptic number.

It is an amenable number.

210012211021 is a deficient number, since it is larger than the sum of its proper divisors (188015631).

210012211021 is a wasteful number, since it uses less digits than its factorization.

210012211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188015630.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 210012211021 its reverse (120112210012), we get a palindrome (330124421033).

The spelling of 210012211021 in words is "two hundred ten billion, twelve million, two hundred eleven thousand, twenty-one".