2111421440 has 44 divisors (see below), whose sum is σ = 5064949416. Its totient is φ = 844566528.

The previous prime is 2111421409. The next prime is 2111421443. The reversal of 2111421440 is 441241112.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111421443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201074 + ... + 211313.

Almost surely, 2^2111421440 is an apocalyptic number.

2111421440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2111421440 is an abundant number, since it is smaller than the sum of its proper divisors (2953527976).

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

2111421440 is an equidigital number, since it uses as much as digits as its factorization.

2111421440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412412 (or 412394 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 2111421440 is about 45950.2060931178. The cubic root of 2111421440 is about 1282.8965652974.

Adding to 2111421440 its reverse (441241112), we get a palindrome (2552662552).

The spelling of 2111421440 in words is "two billion, one hundred eleven million, four hundred twenty-one thousand, four hundred forty".