210021212111 has 16 divisors (see below), whose sum is σ = 213906521088. Its totient is φ = 206163266400.

The previous prime is 210021212083. The next prime is 210021212129. The reversal of 210021212111 is 111212120012.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210021212111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210021212411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20498756 + ... + 20508998.

It is an arithmetic number, because the mean of its divisors is an integer number (13369157568).

Almost surely, 2^210021212111 is an apocalyptic number.

210021212111 is a deficient number, since it is larger than the sum of its proper divisors (3885308977).

210021212111 is a wasteful number, since it uses less digits than its factorization.

210021212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11542.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 210021212111 its reverse (111212120012), we get a palindrome (321233332123).

The spelling of 210021212111 in words is "two hundred ten billion, twenty-one million, two hundred twelve thousand, one hundred eleven".