1021400688 has 360 divisors, whose sum is σ = 3500723856. Its totient is φ = 255467520.

The previous prime is 1021400641. The next prime is 1021400711. The reversal of 1021400688 is 8860041201.

1021400688 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 10529856 + ... + 10529952.

Almost surely, 2^1021400688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021400688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1750361928).

1021400688 is an abundant number, since it is smaller than the sum of its proper divisors (2479323168).

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

1021400688 is a wasteful number, since it uses less digits than its factorization.

1021400688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181 (or 157 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 1021400688 is about 31959.3599435283. The cubic root of 1021400688 is about 1007.0832714696.

Adding to 1021400688 its reverse (8860041201), we get a palindrome (9881441889).

The spelling of 1021400688 in words is "one billion, twenty-one million, four hundred thousand, six hundred eighty-eight".