211421032021 has 4 divisors (see below), whose sum is σ = 218241065344. Its totient is φ = 204600998700.

The previous prime is 211421032019. The next prime is 211421032027. The reversal of 211421032021 is 120230124112.

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 211421032021 - 2¹ = 211421032019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211421032021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211421032027) 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, 3410016615 + ... + 3410016676.

It is an arithmetic number, because the mean of its divisors is an integer number (54560266336).

Almost surely, 2^211421032021 is an apocalyptic number.

It is an amenable number.

211421032021 is a deficient number, since it is larger than the sum of its proper divisors (6820033323).

211421032021 is an equidigital number, since it uses as much as digits as its factorization.

211421032021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6820033322.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 211421032021 its reverse (120230124112), we get a palindrome (331651156133).

The spelling of 211421032021 in words is "two hundred eleven billion, four hundred twenty-one million, thirty-two thousand, twenty-one".