211213947 has 8 divisors (see below), whose sum is σ = 321849856. Its totient is φ = 120693672.

The previous prime is 211213939. The next prime is 211213969. The reversal of 211213947 is 749312112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 211213947 - 2³ = 211213939 is a prime.

It is a super-2 number, since 2×211213947² = 89222662814637618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211213147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5028883 + ... + 5028924.

It is an arithmetic number, because the mean of its divisors is an integer number (40231232).

Almost surely, 2^211213947 is an apocalyptic number.

211213947 is a deficient number, since it is larger than the sum of its proper divisors (110635909).

211213947 is a wasteful number, since it uses less digits than its factorization.

211213947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10057817.

The product of its digits is 3024, while the sum is 30.

The square root of 211213947 is about 14533.2015399223. The cubic root of 211213947 is about 595.5353297131.

The spelling of 211213947 in words is "two hundred eleven million, two hundred thirteen thousand, nine hundred forty-seven".