281421020 has 24 divisors (see below), whose sum is σ = 594054384. Its totient is φ = 111983616.

The previous prime is 281421013. The next prime is 281421037. The reversal of 281421020 is 20124182.

It is a happy number.

281421020 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 281420983 and 281421001.

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, 32594 + ... + 40313.

It is an arithmetic number, because the mean of its divisors is an integer number (24752266).

Almost surely, 2^281421020 is an apocalyptic number.

281421020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

281421020 is an abundant number, since it is smaller than the sum of its proper divisors (312633364).

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

281421020 is a wasteful number, since it uses less digits than its factorization.

281421020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73109 (or 73107 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 281421020 is about 16775.6078876445. The cubic root of 281421020 is about 655.3181214050.

The spelling of 281421020 in words is "two hundred eighty-one million, four hundred twenty-one thousand, twenty".