1021921488 has 320 divisors, whose sum is σ = 3561676800. Its totient is φ = 274337280.

The previous prime is 1021921469. The next prime is 1021921499. The reversal of 1021921488 is 8841291201.

It is a happy number.

It is a super-2 number, since 2×1021921488² = 2088647055272268288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3770793 + ... + 3771063.

It is an arithmetic number, because the mean of its divisors is an integer number (11130240).

Almost surely, 2^1021921488 is an apocalyptic number.

1021921488 is a gapful number since it is divisible by the number (18) 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 1021921488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1780838400).

1021921488 is an abundant number, since it is smaller than the sum of its proper divisors (2539755312).

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

1021921488 is a wasteful number, since it uses less digits than its factorization.

1021921488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367 (or 355 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 1021921488 is about 31967.5067529515. The cubic root of 1021921488 is about 1007.2544089594.

The spelling of 1021921488 in words is "one billion, twenty-one million, nine hundred twenty-one thousand, four hundred eighty-eight".