211212102021 has 16 divisors (see below), whose sum is σ = 284266988544. Its totient is φ = 139488271344.

The previous prime is 211212101953. The next prime is 211212102109. The reversal of 211212102021 is 120201212112.

It is not a de Polignac number, because 211212102021 - 2⁹ = 211212101509 is a prime.

It is a super-2 number, since 2×211212102021² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211212103021) 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, 553341 + ... + 853586.

It is an arithmetic number, because the mean of its divisors is an integer number (17766686784).

Almost surely, 2^211212102021 is an apocalyptic number.

It is an amenable number.

211212102021 is a deficient number, since it is larger than the sum of its proper divisors (73054886523).

211212102021 is a wasteful number, since it uses less digits than its factorization.

211212102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1407400.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 211212102021 its reverse (120201212112), we get a palindrome (331413314133).

The spelling of 211212102021 in words is "two hundred eleven billion, two hundred twelve million, one hundred two thousand, twenty-one".