2021252240 has 40 divisors (see below), whose sum is σ = 5370757440. Its totient is φ = 693000576.

The previous prime is 2021252171. The next prime is 2021252257. The reversal of 2021252240 is 422521202.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1804130 + ... + 1805249.

It is an arithmetic number, because the mean of its divisors is an integer number (134268936).

Almost surely, 2^2021252240 is an apocalyptic number.

2021252240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021252240 is an abundant number, since it is smaller than the sum of its proper divisors (3349505200).

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

2021252240 is a wasteful number, since it uses less digits than its factorization.

2021252240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3609399 (or 3609393 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 2021252240 is about 44958.3389372873. The cubic root of 2021252240 is about 1264.3680262806.

Adding to 2021252240 its reverse (422521202), we get a palindrome (2443773442).

The spelling of 2021252240 in words is "two billion, twenty-one million, two hundred fifty-two thousand, two hundred forty".