2021664140 has 48 divisors (see below), whose sum is σ = 4499712000. Its totient is φ = 760338432.

The previous prime is 2021664131. The next prime is 2021664149. The reversal of 2021664140 is 414661202.

It is an interprime number because it is at equal distance from previous prime (2021664131) and next prime (2021664149).

It is not an unprimeable number, because it can be changed into a prime (2021664149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 432536 + ... + 437184.

It is an arithmetic number, because the mean of its divisors is an integer number (93744000).

Almost surely, 2^2021664140 is an apocalyptic number.

2021664140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021664140 is an abundant number, since it is smaller than the sum of its proper divisors (2478047860).

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

2021664140 is a wasteful number, since it uses less digits than its factorization.

2021664140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5954 (or 5952 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 2021664140 is about 44962.9196116089. The cubic root of 2021664140 is about 1264.4539066748.

The spelling of 2021664140 in words is "two billion, twenty-one million, six hundred sixty-four thousand, one hundred forty".