21761214 has 16 divisors (see below), whose sum is σ = 43812480. Its totient is φ = 7205400.

The previous prime is 21761191. The next prime is 21761219. The reversal of 21761214 is 41216712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21761219) 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, 11104 + ... + 12915.

It is an arithmetic number, because the mean of its divisors is an integer number (2738280).

Almost surely, 2^21761214 is an apocalyptic number.

21761214 is an abundant number, since it is smaller than the sum of its proper divisors (22051266).

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

21761214 is a wasteful number, since it uses less digits than its factorization.

21761214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24175.

The product of its digits is 672, while the sum is 24.

The square root of 21761214 is about 4664.8916386128. The cubic root of 21761214 is about 279.1864736621.

Adding to 21761214 its reverse (41216712), we get a palindrome (62977926).

The spelling of 21761214 in words is "twenty-one million, seven hundred sixty-one thousand, two hundred fourteen".