2640932021 has 16 divisors (see below), whose sum is σ = 3319540224. Its totient is φ = 2045067264.

The previous prime is 2640932003. The next prime is 2640932033. The reversal of 2640932021 is 1202390462.

It is a cyclic number.

It is not a de Polignac number, because 2640932021 - 2⁶ = 2640931957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640932081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 304460 + ... + 313013.

It is an arithmetic number, because the mean of its divisors is an integer number (207471264).

Almost surely, 2^2640932021 is an apocalyptic number.

It is an amenable number.

2640932021 is a deficient number, since it is larger than the sum of its proper divisors (678608203).

2640932021 is a wasteful number, since it uses less digits than its factorization.

2640932021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617540.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 2640932021 is about 51389.9992313680. Note that the first 3 decimals coincide. The cubic root of 2640932021 is about 1382.2472697847.

The spelling of 2640932021 in words is "two billion, six hundred forty million, nine hundred thirty-two thousand, twenty-one".