21160206 has 24 divisors (see below), whose sum is σ = 48544704. Its totient is φ = 6638400.

The previous prime is 21160177. The next prime is 21160211. The reversal of 21160206 is 60206112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34270 + ... + 34881.

It is an arithmetic number, because the mean of its divisors is an integer number (2022696).

Almost surely, 2^21160206 is an apocalyptic number.

21160206 is an abundant number, since it is smaller than the sum of its proper divisors (27384498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21160206 is a wasteful number, since it uses less digits than its factorization.

21160206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69176 (or 69173 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 21160206 is about 4600.0223912499. The cubic root of 21160206 is about 276.5922223538.

Adding to 21160206 its reverse (60206112), we get a palindrome (81366318).

The spelling of 21160206 in words is "twenty-one million, one hundred sixty thousand, two hundred six".