213169947 has 16 divisors (see below), whose sum is σ = 295516032. Its totient is φ = 136572480.

The previous prime is 213169939. The next prime is 213169967. The reversal of 213169947 is 749961312.

It is not a de Polignac number, because 213169947 - 2³ = 213169939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213169899 and 213169908.

It is not an unprimeable number, because it can be changed into a prime (213169907) 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, 4693 + ... + 21174.

It is an arithmetic number, because the mean of its divisors is an integer number (18469752).

Almost surely, 2^213169947 is an apocalyptic number.

213169947 is a deficient number, since it is larger than the sum of its proper divisors (82346085).

213169947 is a wasteful number, since it uses less digits than its factorization.

213169947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25978.

The product of its digits is 81648, while the sum is 42.

The square root of 213169947 is about 14600.3406467110. The cubic root of 213169947 is about 597.3680521881.

The spelling of 213169947 in words is "two hundred thirteen million, one hundred sixty-nine thousand, nine hundred forty-seven".