1421255550 has 192 divisors, whose sum is σ = 4175732736. Its totient is φ = 315379200.

The previous prime is 1421255503. The next prime is 1421255557. The reversal of 1421255550 is 555521241.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421255557) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3710659 + ... + 3711041.

It is an arithmetic number, because the mean of its divisors is an integer number (21748608).

Almost surely, 2^1421255550 is an apocalyptic number.

1421255550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1421255550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2087866368).

1421255550 is an abundant number, since it is smaller than the sum of its proper divisors (2754477186).

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

1421255550 is a wasteful number, since it uses less digits than its factorization.

1421255550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595 (or 590 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 30.

The square root of 1421255550 is about 37699.5431006796. The cubic root of 1421255550 is about 1124.3220409061.

Adding to 1421255550 its reverse (555521241), we get a palindrome (1976776791).

The spelling of 1421255550 in words is "one billion, four hundred twenty-one million, two hundred fifty-five thousand, five hundred fifty".