212102122122021 has 16 divisors (see below), whose sum is σ = 289702775513088. Its totient is φ = 137951496883200.

The previous prime is 212102122121969. The next prime is 212102122122139. The reversal of 212102122122021 is 120221221201212.

It is not a de Polignac number, because 212102122122021 - 2⁶ = 212102122121957 is a prime.

It is a super-3 number, since 3×212102122122021³ (a number of 44 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212102122322021) 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, 8697820 + ... + 22357466.

It is an arithmetic number, because the mean of its divisors is an integer number (18106423469568).

Almost surely, 2^{212102122122021} is an apocalyptic number.

It is an amenable number.

212102122122021 is a deficient number, since it is larger than the sum of its proper divisors (77600653391067).

212102122122021 is a wasteful number, since it uses less digits than its factorization.

212102122122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13785932.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 212102122122021 its reverse (120221221201212), we get a palindrome (332323343323233).

The spelling of 212102122122021 in words is "two hundred twelve trillion, one hundred two billion, one hundred twenty-two million, one hundred twenty-two thousand, twenty-one".