2664236421 has 64 divisors (see below), whose sum is σ = 4931082240. Its totient is φ = 1381173120.

The previous prime is 2664236389. The next prime is 2664236459. The reversal of 2664236421 is 1246324662.

2664236421 is a `hidden beast` number, since 2 + 6 + 6 + 4 + 2 + 3 + 642 + 1 = 666.

It is not a de Polignac number, because 2664236421 - 2⁵ = 2664236389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2664236461) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1335801 + ... + 1337793.

It is an arithmetic number, because the mean of its divisors is an integer number (77048160).

Almost surely, 2^2664236421 is an apocalyptic number.

2664236421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2664236421 is a deficient number, since it is larger than the sum of its proper divisors (2266845819).

2664236421 is a wasteful number, since it uses less digits than its factorization.

2664236421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2663 (or 2657 counting only the distinct ones).

The product of its digits is 82944, while the sum is 36.

The square root of 2664236421 is about 51616.2418333609. The cubic root of 2664236421 is about 1386.3011611078.

The spelling of 2664236421 in words is "two billion, six hundred sixty-four million, two hundred thirty-six thousand, four hundred twenty-one".