212001121110021 has 16 divisors (see below), whose sum is σ = 287792095940544. Its totient is φ = 138785422431744.

The previous prime is 212001121110017. The next prime is 212001121110043. The reversal of 212001121110021 is 120011121100212.

It is a happy number.

It is not a de Polignac number, because 212001121110021 - 2² = 212001121110017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212001121110001) 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, 1663551340 + ... + 1663678773.

It is an arithmetic number, because the mean of its divisors is an integer number (17987005996284).

Almost surely, 2^{212001121110021} is an apocalyptic number.

It is an amenable number.

212001121110021 is a deficient number, since it is larger than the sum of its proper divisors (75790974830523).

212001121110021 is a wasteful number, since it uses less digits than its factorization.

212001121110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3327230500.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 212001121110021 its reverse (120011121100212), we get a palindrome (332012242210233).

The spelling of 212001121110021 in words is "two hundred twelve trillion, one billion, one hundred twenty-one million, one hundred ten thousand, twenty-one".