211142020021 has 4 divisors (see below), whose sum is σ = 220322107872. Its totient is φ = 201961932172.

The previous prime is 211142019989. The next prime is 211142020031. The reversal of 211142020021 is 120020241112.

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 211142020021 - 2⁵ = 211142019989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211142019977 and 211142020004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211142020031) 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, 4590043891 + ... + 4590043936.

It is an arithmetic number, because the mean of its divisors is an integer number (55080526968).

Almost surely, 2^211142020021 is an apocalyptic number.

It is an amenable number.

211142020021 is a deficient number, since it is larger than the sum of its proper divisors (9180087851).

211142020021 is an equidigital number, since it uses as much as digits as its factorization.

211142020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9180087850.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 211142020021 its reverse (120020241112), we get a palindrome (331162261133).

The spelling of 211142020021 in words is "two hundred eleven billion, one hundred forty-two million, twenty thousand, twenty-one".