22521420 has 36 divisors (see below), whose sum is σ = 68315520. Its totient is φ = 6005664.

The previous prime is 22521409. The next prime is 22521431. The reversal of 22521420 is 2412522.

22521420 is a `hidden beast` number, since 225 + 21 + 420 = 666.

It is an interprime number because it is at equal distance from previous prime (22521409) and next prime (22521431).

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a junction number, because it is equal to n+sod(n) for n = 22521393 and 22521402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62380 + ... + 62739.

Almost surely, 2^22521420 is an apocalyptic number.

22521420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22521420 is an abundant number, since it is smaller than the sum of its proper divisors (45794100).

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

22521420 is a wasteful number, since it uses less digits than its factorization.

22521420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125134 (or 125129 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 22521420 is about 4745.6738193854. The cubic root of 22521420 is about 282.4003668805.

Adding to 22521420 its reverse (2412522), we get a palindrome (24933942).

The spelling of 22521420 in words is "twenty-two million, five hundred twenty-one thousand, four hundred twenty".