1001421252 has 96 divisors (see below), whose sum is σ = 2815344000. Its totient is φ = 305997696.

The previous prime is 1001421251. The next prime is 1001421293. The reversal of 1001421252 is 2521241001.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1001421251) 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, 206803 + ... + 211589.

It is an arithmetic number, because the mean of its divisors is an integer number (29326500).

Almost surely, 2^1001421252 is an apocalyptic number.

1001421252 is a gapful number since it is divisible by the number (12) 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 1001421252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1407672000).

1001421252 is an abundant number, since it is smaller than the sum of its proper divisors (1813922748).

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

1001421252 is a wasteful number, since it uses less digits than its factorization.

1001421252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4962 (or 4954 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 1001421252 is about 31645.2405900161. The cubic root of 1001421252 is about 1000.4735264040.

Adding to 1001421252 its reverse (2521241001), we get a palindrome (3522662253).

The spelling of 1001421252 in words is "one billion, one million, four hundred twenty-one thousand, two hundred fifty-two".