21250414 has 16 divisors (see below), whose sum is σ = 32400000. Its totient is φ = 10452024.

The previous prime is 21250399. The next prime is 21250429. The reversal of 21250414 is 41405212.

It is an interprime number because it is at equal distance from previous prime (21250399) and next prime (21250429).

It is a junction number, because it is equal to n+sod(n) for n = 21250391 and 21250400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42337 + ... + 42835.

It is an arithmetic number, because the mean of its divisors is an integer number (2025000).

Almost surely, 2^21250414 is an apocalyptic number.

21250414 is a deficient number, since it is larger than the sum of its proper divisors (11149586).

21250414 is a wasteful number, since it uses less digits than its factorization.

21250414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 21250414 is about 4609.8171330325. The cubic root of 21250414 is about 276.9847115857.

Adding to 21250414 its reverse (41405212), we get a palindrome (62655626).

The spelling of 21250414 in words is "twenty-one million, two hundred fifty thousand, four hundred fourteen".