212012121111021 has 48 divisors (see below), whose sum is σ = 382802259640320. Its totient is φ = 109848604880160.

The previous prime is 212012121110989. The next prime is 212012121111053. The reversal of 212012121111021 is 120111121210212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (212012121110989) and next prime (212012121111053).

It is not a de Polignac number, because 212012121111021 - 2⁵ = 212012121110989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212012121110985 and 212012121111003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212012121111821) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 399125961 + ... + 399656798.

It is an arithmetic number, because the mean of its divisors is an integer number (7975047075840).

Almost surely, 2^{212012121111021} is an apocalyptic number.

212012121111021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

212012121111021 is a deficient number, since it is larger than the sum of its proper divisors (170790138529299).

212012121111021 is a wasteful number, since it uses less digits than its factorization.

212012121111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798783166 (or 798783163 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 212012121111021 its reverse (120111121210212), we get a palindrome (332123242321233).

The spelling of 212012121111021 in words is "two hundred twelve trillion, twelve billion, one hundred twenty-one million, one hundred eleven thousand, twenty-one".