211201011220021 has 4 divisors (see below), whose sum is σ = 211624259740000. Its totient is φ = 210777762700044.

The previous prime is 211201011220007. The next prime is 211201011220027. The reversal of 211201011220021 is 120022110102112.

211201011220021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 211201011220021 - 2²¹ = 211201009122869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211201011219977 and 211201011220004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211201011220027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211624259241 + ... + 211624260238.

It is an arithmetic number, because the mean of its divisors is an integer number (52906064935000).

Almost surely, 2^{211201011220021} is an apocalyptic number.

It is an amenable number.

211201011220021 is a deficient number, since it is larger than the sum of its proper divisors (423248519979).

211201011220021 is an equidigital number, since it uses as much as digits as its factorization.

211201011220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423248519978.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 211201011220021 its reverse (120022110102112), we get a palindrome (331223121322133).

The spelling of 211201011220021 in words is "two hundred eleven trillion, two hundred one billion, eleven million, two hundred twenty thousand, twenty-one".