211421023021 has 8 divisors (see below), whose sum is σ = 227724084504. Its totient is φ = 195123662400.

The previous prime is 211421023007. The next prime is 211421023027. The reversal of 211421023021 is 120320124112.

It can be written as a sum of positive squares in 4 ways, for example, as 65027550025 + 146393472996 = 255005^2 + 382614^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211421023021 - 2⁹ = 211421022509 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 211421023021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211421023027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1348030 + ... + 1496671.

It is an arithmetic number, because the mean of its divisors is an integer number (28465510563).

Almost surely, 2^211421023021 is an apocalyptic number.

It is an amenable number.

211421023021 is a deficient number, since it is larger than the sum of its proper divisors (16303061483).

211421023021 is a wasteful number, since it uses less digits than its factorization.

211421023021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2850431.

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

Adding to 211421023021 its reverse (120320124112), we get a palindrome (331741147133).

The spelling of 211421023021 in words is "two hundred eleven billion, four hundred twenty-one million, twenty-three thousand, twenty-one".