211470721 has 12 divisors (see below), whose sum is σ = 268360560. Its totient is φ = 164781960.

The previous prime is 211470709. The next prime is 211470751. The reversal of 211470721 is 127074112.

It is not a de Polignac number, because 211470721 - 2¹⁵ = 211437953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211470751) 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, 195631 + ... + 196708.

It is an arithmetic number, because the mean of its divisors is an integer number (22363380).

Almost surely, 2^211470721 is an apocalyptic number.

It is an amenable number.

211470721 is a deficient number, since it is larger than the sum of its proper divisors (56889839).

211470721 is a wasteful number, since it uses less digits than its factorization.

211470721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392364 (or 392357 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 25.

The square root of 211470721 is about 14542.0329046526. The cubic root of 211470721 is about 595.7765638819.

The spelling of 211470721 in words is "two hundred eleven million, four hundred seventy thousand, seven hundred twenty-one".