1021221424 has 20 divisors (see below), whose sum is σ = 2082754840. Its totient is φ = 483736320.

The previous prime is 1021221379. The next prime is 1021221469. The reversal of 1021221424 is 4241221201.

It is an interprime number because it is at equal distance from previous prime (1021221379) and next prime (1021221469).

It is a Harshad number since it is a multiple of its sum of digits (19).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1679337 + ... + 1679944.

It is an arithmetic number, because the mean of its divisors is an integer number (104137742).

Almost surely, 2^1021221424 is an apocalyptic number.

It is an amenable number.

1021221424 is an abundant number, since it is smaller than the sum of its proper divisors (1061533416).

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

1021221424 is a wasteful number, since it uses less digits than its factorization.

1021221424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3359308 (or 3359302 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 1021221424 is about 31956.5552586633. Note that the first 3 decimals coincide. The cubic root of 1021221424 is about 1007.0243509629.

Adding to 1021221424 its reverse (4241221201), we get a palindrome (5262442625).

The spelling of 1021221424 in words is "one billion, twenty-one million, two hundred twenty-one thousand, four hundred twenty-four".