1021421400 has 48 divisors (see below), whose sum is σ = 3166408200. Its totient is φ = 272378880.

The previous prime is 1021421381. The next prime is 1021421411. The reversal of 1021421400 is 41241201.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1021421400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 850585 + ... + 851784.

Almost surely, 2^1021421400 is an apocalyptic number.

1021421400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021421400 is an abundant number, since it is smaller than the sum of its proper divisors (2144986800).

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

1021421400 is a wasteful number, since it uses less digits than its factorization.

1021421400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1702388 (or 1702379 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 1021421400 is about 31959.6839784126. The cubic root of 1021421400 is about 1007.0900786472.

Adding to 1021421400 its reverse (41241201), we get a palindrome (1062662601).

The spelling of 1021421400 in words is "one billion, twenty-one million, four hundred twenty-one thousand, four hundred".