22121420 has 24 divisors (see below), whose sum is σ = 49188384. Its totient is φ = 8327936.

The previous prime is 22121387. The next prime is 22121431. The reversal of 22121420 is 2412122.

It is a junction number, because it is equal to n+sod(n) for n = 22121395 and 22121404.

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, 32192 + ... + 32871.

It is an arithmetic number, because the mean of its divisors is an integer number (2049516).

Almost surely, 2^22121420 is an apocalyptic number.

22121420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22121420 is an abundant number, since it is smaller than the sum of its proper divisors (27066964).

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

22121420 is a wasteful number, since it uses less digits than its factorization.

22121420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65089 (or 65087 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 22121420 is about 4703.3413654550. The cubic root of 22121420 is about 280.7184779432.

Adding to 22121420 its reverse (2412122), we get a palindrome (24533542).

The spelling of 22121420 in words is "twenty-two million, one hundred twenty-one thousand, four hundred twenty".