10021001220 has 144 divisors (see below), whose sum is σ = 32934021120. Its totient is φ = 2456552448.

The previous prime is 10021001201. The next prime is 10021001239. The reversal of 10021001220 is 2210012001.

It is an interprime number because it is at equal distance from previous prime (10021001201) and next prime (10021001239).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 93501 + ... + 169659.

It is an arithmetic number, because the mean of its divisors is an integer number (228708480).

Almost surely, 2^10021001220 is an apocalyptic number.

10021001220 is a gapful number since it is divisible by the number (10) 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 10021001220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16467010560).

10021001220 is an abundant number, since it is smaller than the sum of its proper divisors (22913019900).

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

10021001220 is a wasteful number, since it uses less digits than its factorization.

10021001220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76234 (or 76229 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 10021001220 its reverse (2210012001), we get a palindrome (12231013221).

The spelling of 10021001220 in words is "ten billion, twenty-one million, one thousand, two hundred twenty".