211421023399 has 4 divisors (see below), whose sum is σ = 211422943800. Its totient is φ = 211419103000.

The previous prime is 211421023343. The next prime is 211421023459. The reversal of 211421023399 is 993320124112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 211421023399 - 2⁹ = 211421022887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211421023199) 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, 784324 + ... + 1018825.

It is an arithmetic number, because the mean of its divisors is an integer number (52855735950).

Almost surely, 2^211421023399 is an apocalyptic number.

211421023399 is a deficient number, since it is larger than the sum of its proper divisors (1920401).

211421023399 is a wasteful number, since it uses less digits than its factorization.

211421023399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1920400.

The product of its (nonzero) digits is 23328, while the sum is 37.

The spelling of 211421023399 in words is "two hundred eleven billion, four hundred twenty-one million, twenty-three thousand, three hundred ninety-nine".