211400431 has 12 divisors (see below), whose sum is σ = 232935136. Its totient is φ = 191711520.

The previous prime is 211400353. The next prime is 211400443. The reversal of 211400431 is 134004112.

It is not a de Polignac number, because 211400431 - 2⁷ = 211400303 is a prime.

It is a super-2 number, since 2×211400431² = 89380284453971522, 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 (211400131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53386 + ... + 57208.

Almost surely, 2^211400431 is an apocalyptic number.

211400431 is a deficient number, since it is larger than the sum of its proper divisors (21534705).

211400431 is a wasteful number, since it uses less digits than its factorization.

211400431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4302 (or 4291 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 211400431 is about 14539.6159165227. The cubic root of 211400431 is about 595.7105472167.

Adding to 211400431 its reverse (134004112), we get a palindrome (345404543).

The spelling of 211400431 in words is "two hundred eleven million, four hundred thousand, four hundred thirty-one".