212001200021 has 32 divisors (see below), whose sum is σ = 231075532800. Its totient is φ = 193342464000.

The previous prime is 212001200009. The next prime is 212001200039. The reversal of 212001200021 is 120002100212.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212001200021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 212001199975 and 212001200011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212001200041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 352747121 + ... + 352747721.

It is an arithmetic number, because the mean of its divisors is an integer number (7221110400).

Almost surely, 2^212001200021 is an apocalyptic number.

It is an amenable number.

212001200021 is a deficient number, since it is larger than the sum of its proper divisors (19074332779).

212001200021 is a wasteful number, since it uses less digits than its factorization.

212001200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1557.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 212001200021 its reverse (120002100212), we get a palindrome (332003300233).

It can be divided in two parts, 21200 and 1200021, that added together give a palindrome (1221221).

The spelling of 212001200021 in words is "two hundred twelve billion, one million, two hundred thousand, twenty-one".