211400997 has 16 divisors (see below), whose sum is σ = 292208640. Its totient is φ = 135802800.

The previous prime is 211400963. The next prime is 211400999. The reversal of 211400997 is 799004112.

211400997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-211400997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211400999) 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, 17472 + ... + 26982.

It is an arithmetic number, because the mean of its divisors is an integer number (18263040).

Almost surely, 2^211400997 is an apocalyptic number.

It is an amenable number.

211400997 is a deficient number, since it is larger than the sum of its proper divisors (80807643).

211400997 is a wasteful number, since it uses less digits than its factorization.

211400997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9784.

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 211400997 is about 14539.6353805727. The cubic root of 211400997 is about 595.7110788647.

The spelling of 211400997 in words is "two hundred eleven million, four hundred thousand, nine hundred ninety-seven".