211420512421 has 4 divisors (see below), whose sum is σ = 211511136492. Its totient is φ = 211329888352.

The previous prime is 211420512397. The next prime is 211420512449. The reversal of 211420512421 is 124215024112.

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

It can be written as a sum of positive squares in 2 ways, for example, as 117775944225 + 93644568196 = 343185^2 + 306014^2 .

It is a cyclic number.

It is not a de Polignac number, because 211420512421 - 2³⁵ = 177060774053 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 (211420512521) 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, 45308536 + ... + 45313201.

It is an arithmetic number, because the mean of its divisors is an integer number (52877784123).

Almost surely, 2^211420512421 is an apocalyptic number.

It is an amenable number.

211420512421 is a deficient number, since it is larger than the sum of its proper divisors (90624071).

211420512421 is an equidigital number, since it uses as much as digits as its factorization.

211420512421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90624070.

The product of its (nonzero) digits is 1280, while the sum is 25.

Adding to 211420512421 its reverse (124215024112), we get a palindrome (335635536533).

The spelling of 211420512421 in words is "two hundred eleven billion, four hundred twenty million, five hundred twelve thousand, four hundred twenty-one".