212100011001021 has 48 divisors (see below), whose sum is σ = 338071982693760. Its totient is φ = 117482523312000.

The previous prime is 212100011001013. The next prime is 212100011001023. The reversal of 212100011001021 is 120100110001212.

It is not a de Polignac number, because 212100011001021 - 2³ = 212100011001013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212100011000988 and 212100011001006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212100011001023) 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, 222028161 + ... + 222981398.

It is an arithmetic number, because the mean of its divisors is an integer number (7043166306120).

Almost surely, 2^{212100011001021} is an apocalyptic number.

It is an amenable number.

212100011001021 is a deficient number, since it is larger than the sum of its proper divisors (125971971692739).

212100011001021 is a wasteful number, since it uses less digits than its factorization.

212100011001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445009698 (or 445009687 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 212100011001021 its reverse (120100110001212), we get a palindrome (332200121002233).

The spelling of 212100011001021 in words is "two hundred twelve trillion, one hundred billion, eleven million, one thousand, twenty-one".