21420414 has 12 divisors (see below), whose sum is σ = 46410936. Its totient is φ = 7140132.

The previous prime is 21420403. The next prime is 21420433. The reversal of 21420414 is 41402412.

It is a super-3 number, since 3×21420414³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1190023 = 21420414 / (2 + 1 + 4 + 2 + 0 + 4 + 1 + 4).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 594994 + ... + 595029.

It is an arithmetic number, because the mean of its divisors is an integer number (3867578).

Almost surely, 2^21420414 is an apocalyptic number.

21420414 is an abundant number, since it is smaller than the sum of its proper divisors (24990522).

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

21420414 is a wasteful number, since it uses less digits than its factorization.

21420414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1190031 (or 1190028 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 21420414 is about 4628.2193120033. The cubic root of 21420414 is about 277.7213622082.

Adding to 21420414 its reverse (41402412), we get a palindrome (62822826).

The spelling of 21420414 in words is "twenty-one million, four hundred twenty thousand, four hundred fourteen".