1421225520 has 160 divisors (see below), whose sum is σ = 5176168704. Its totient is φ = 318028800.

The previous prime is 1421225513. The next prime is 1421225549. The reversal of 1421225520 is 255221241.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13615 + ... + 55025.

Almost surely, 2^1421225520 is an apocalyptic number.

1421225520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1421225520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2588084352).

1421225520 is an abundant number, since it is smaller than the sum of its proper divisors (3754943184).

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

1421225520 is a wasteful number, since it uses less digits than its factorization.

1421225520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41451 (or 41445 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 1421225520 is about 37699.1448178868. The cubic root of 1421225520 is about 1124.3141221733.

Adding to 1421225520 its reverse (255221241), we get a palindrome (1676446761).

The spelling of 1421225520 in words is "one billion, four hundred twenty-one million, two hundred twenty-five thousand, five hundred twenty".