2021555130 has 128 divisors (see below), whose sum is σ = 5706049536. Its totient is φ = 448761600.

The previous prime is 2021555111. The next prime is 2021555161. The reversal of 2021555130 is 315551202.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2021555130.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1904800 + ... + 1905860.

It is an arithmetic number, because the mean of its divisors is an integer number (44578512).

Almost surely, 2^2021555130 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2021555130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2853024768).

2021555130 is an abundant number, since it is smaller than the sum of its proper divisors (3684494406).

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

2021555130 is a wasteful number, since it uses less digits than its factorization.

2021555130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332.

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 2021555130 is about 44961.7073741645. The cubic root of 2021555130 is about 1264.4311794249.

The spelling of 2021555130 in words is "two billion, twenty-one million, five hundred fifty-five thousand, one hundred thirty".