212112201021 has 24 divisors (see below), whose sum is σ = 332954110944. Its totient is φ = 119746640160.

The previous prime is 212112200987. The next prime is 212112201071. The reversal of 212112201021 is 120102211212.

It is not a de Polignac number, because 212112201021 - 2²¹ = 212110103869 is a prime.

It is a super-2 number, since 2×212112201021² (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 (212112201071) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8680210 + ... + 8704611.

It is an arithmetic number, because the mean of its divisors is an integer number (13873087956).

Almost surely, 2^212112201021 is an apocalyptic number.

212112201021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

212112201021 is a deficient number, since it is larger than the sum of its proper divisors (120841909923).

212112201021 is a wasteful number, since it uses less digits than its factorization.

212112201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17384921 (or 17384914 counting only the distinct ones).

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

Adding to 212112201021 its reverse (120102211212), we get a palindrome (332214412233).

The spelling of 212112201021 in words is "two hundred twelve billion, one hundred twelve million, two hundred one thousand, twenty-one".