1001021421 has 32 divisors (see below), whose sum is σ = 1455442560. Its totient is φ = 609417216.

The previous prime is 1001021401. The next prime is 1001021429. The reversal of 1001021421 is 1241201001.

It is a happy number.

It is not a de Polignac number, because 1001021421 - 2⁵ = 1001021389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1001021397 and 1001021406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001021429) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1167625 + ... + 1168481.

It is an arithmetic number, because the mean of its divisors is an integer number (45482580).

Almost surely, 2^1001021421 is an apocalyptic number.

It is an amenable number.

1001021421 is a deficient number, since it is larger than the sum of its proper divisors (454421139).

1001021421 is a wasteful number, since it uses less digits than its factorization.

1001021421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1533.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1001021421 is about 31638.9225638295. The cubic root of 1001021421 is about 1000.3403578101.

Adding to 1001021421 its reverse (1241201001), we get a palindrome (2242222422).

The spelling of 1001021421 in words is "one billion, one million, twenty-one thousand, four hundred twenty-one".