21040414 has 4 divisors (see below), whose sum is σ = 31560624. Its totient is φ = 10520206.

The previous prime is 21040387. The next prime is 21040427. The reversal of 21040414 is 41404012.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5260102 + ... + 5260105.

It is an arithmetic number, because the mean of its divisors is an integer number (7890156).

Almost surely, 2^21040414 is an apocalyptic number.

21040414 is a deficient number, since it is larger than the sum of its proper divisors (10520210).

21040414 is a wasteful number, since it uses less digits than its factorization.

21040414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10520209.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 21040414 is about 4586.9831043944. The cubic root of 21040414 is about 276.0692870226.

Adding to 21040414 its reverse (41404012), we get a palindrome (62444426).

The spelling of 21040414 in words is "twenty-one million, forty thousand, four hundred fourteen".