4001021000 has 64 divisors (see below), whose sum is σ = 9580222080. Its totient is φ = 1563172800.

The previous prime is 4001020987. The next prime is 4001021023. The reversal of 4001021000 is 1201004.

It is a Harshad number since it is a multiple of its sum of digits (8).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3524 + ... + 89523.

It is an arithmetic number, because the mean of its divisors is an integer number (149690970).

Almost surely, 2^4001021000 is an apocalyptic number.

4001021000 is a gapful number since it is divisible by the number (40) 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 4001021000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4790111040).

4001021000 is an abundant number, since it is smaller than the sum of its proper divisors (5579201080).

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

4001021000 is a wasteful number, since it uses less digits than its factorization.

4001021000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93111 (or 93097 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 4001021000 is about 63253.6244020847. The cubic root of 4001021000 is about 1587.5361018512.

Adding to 4001021000 its reverse (1201004), we get a palindrome (4002222004).

The spelling of 4001021000 in words is "four billion, one million, twenty-one thousand".