211077421 has 4 divisors (see below), whose sum is σ = 211106844. Its totient is φ = 211048000.

The previous prime is 211077413. The next prime is 211077431. The reversal of 211077421 is 124770112.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 155276521 + 55800900 = 12461^2 + 7470^2 .

It is a cyclic number.

It is not a de Polignac number, because 211077421 - 2³ = 211077413 is a prime.

It is a super-2 number, since 2×211077421² = 89107355312022482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211077401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3891 + ... + 20911.

It is an arithmetic number, because the mean of its divisors is an integer number (52776711).

Almost surely, 2^211077421 is an apocalyptic number.

It is an amenable number.

211077421 is a deficient number, since it is larger than the sum of its proper divisors (29423).

211077421 is a wasteful number, since it uses less digits than its factorization.

211077421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29422.

The product of its (nonzero) digits is 784, while the sum is 25.

The square root of 211077421 is about 14528.5037426433. The cubic root of 211077421 is about 595.4069865769.

The spelling of 211077421 in words is "two hundred eleven million, seventy-seven thousand, four hundred twenty-one".