211404240000421 has 16 divisors (see below), whose sum is σ = 227978685270000. Its totient is φ = 194874489123840.

The previous prime is 211404240000413. The next prime is 211404240000451. The reversal of 211404240000421 is 124000042404112.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 35833524904321 + 175570715096100 = 5986111^2 + 13250310^2 .

It is a cyclic number.

It is not a de Polignac number, because 211404240000421 - 2³ = 211404240000413 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 (211404240000451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127006455 + ... + 128660203.

It is an arithmetic number, because the mean of its divisors is an integer number (14248667829375).

Almost surely, 2^{211404240000421} is an apocalyptic number.

It is an amenable number.

211404240000421 is a deficient number, since it is larger than the sum of its proper divisors (16574445269579).

211404240000421 is a wasteful number, since it uses less digits than its factorization.

211404240000421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1667256.

The product of its (nonzero) digits is 2048, while the sum is 25.

Adding to 211404240000421 its reverse (124000042404112), we get a palindrome (335404282404533).

The spelling of 211404240000421 in words is "two hundred eleven trillion, four hundred four billion, two hundred forty million, four hundred twenty-one", and thus it is an aban number.