211453421 has 4 divisors (see below), whose sum is σ = 220647072. Its totient is φ = 202259772.

The previous prime is 211453393. The next prime is 211453427. The reversal of 211453421 is 124354112.

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 211453421 - 2⁶ = 211453357 is a prime.

It is a super-5 number, since 5×211453421⁵ (a number of 43 digits) contains 55555 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 9193627 = 211453421 / (2 + 1 + 1 + 4 + 5 + 3 + 4 + 2 + 1).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211453427) 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, 4596791 + ... + 4596836.

It is an arithmetic number, because the mean of its divisors is an integer number (55161768).

Almost surely, 2^211453421 is an apocalyptic number.

It is an amenable number.

211453421 is a deficient number, since it is larger than the sum of its proper divisors (9193651).

211453421 is an equidigital number, since it uses as much as digits as its factorization.

211453421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9193650.

The product of its digits is 960, while the sum is 23.

The square root of 211453421 is about 14541.4380650608. The cubic root of 211453421 is about 595.7603170060.

The spelling of 211453421 in words is "two hundred eleven million, four hundred fifty-three thousand, four hundred twenty-one".