211497021 has 16 divisors (see below), whose sum is σ = 314638720. Its totient is φ = 140408640.

The previous prime is 211496993. The next prime is 211497049. The reversal of 211497021 is 120794112.

211497021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (211496993) and next prime (211497049).

It is not a de Polignac number, because 211497021 - 2⁷ = 211496893 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211499021) 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, 9745 + ... + 22758.

It is an arithmetic number, because the mean of its divisors is an integer number (19664920).

Almost surely, 2^211497021 is an apocalyptic number.

It is an amenable number.

211497021 is a deficient number, since it is larger than the sum of its proper divisors (103141699).

211497021 is a wasteful number, since it uses less digits than its factorization.

211497021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32753 (or 32747 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 211497021 is about 14542.9371517586. The cubic root of 211497021 is about 595.8012611923.

The spelling of 211497021 in words is "two hundred eleven million, four hundred ninety-seven thousand, twenty-one".