212111010021 has 16 divisors (see below), whose sum is σ = 297818421120. Its totient is φ = 134018280000.

The previous prime is 212111009993. The next prime is 212111010031. The reversal of 212111010021 is 120010111212.

It is not a de Polignac number, because 212111010021 - 2⁵ = 212111009989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212111009979 and 212111010006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212111010031) 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, 14093730 + ... + 14108771.

It is an arithmetic number, because the mean of its divisors is an integer number (18613651320).

Almost surely, 2^212111010021 is an apocalyptic number.

It is an amenable number.

212111010021 is a deficient number, since it is larger than the sum of its proper divisors (85707411099).

212111010021 is a wasteful number, since it uses less digits than its factorization.

212111010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28202636.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 212111010021 its reverse (120010111212), we get a palindrome (332121121233).

The spelling of 212111010021 in words is "two hundred twelve billion, one hundred eleven million, ten thousand, twenty-one".