2021501220 has 48 divisors (see below), whose sum is σ = 5744695488. Its totient is φ = 531020160.

The previous prime is 2021501203. The next prime is 2021501281. The reversal of 2021501220 is 221051202.

It is a super-2 number, since 2×2021501220² = 8172934364922976800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 2021501220.

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, 247411 + ... + 255450.

It is an arithmetic number, because the mean of its divisors is an integer number (119681156).

Almost surely, 2^2021501220 is an apocalyptic number.

2021501220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021501220 is an abundant number, since it is smaller than the sum of its proper divisors (3723194268).

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

2021501220 is a wasteful number, since it uses less digits than its factorization.

2021501220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502940 (or 502938 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 2021501220 is about 44961.1078600161. The cubic root of 2021501220 is about 1264.4199395483.

Adding to 2021501220 its reverse (221051202), we get a palindrome (2242552422).

The spelling of 2021501220 in words is "two billion, twenty-one million, five hundred one thousand, two hundred twenty".