2542669821 has 24 divisors (see below), whose sum is σ = 3943577664. Its totient is φ = 1572923520.

The previous prime is 2542669819. The next prime is 2542669867. The reversal of 2542669821 is 1289662452.

It is not a de Polignac number, because 2542669821 - 2¹ = 2542669819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2542669621) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 106171 + ... + 127896.

It is an arithmetic number, because the mean of its divisors is an integer number (164315736).

Almost surely, 2^2542669821 is an apocalyptic number.

It is an amenable number.

2542669821 is a deficient number, since it is larger than the sum of its proper divisors (1400907843).

2542669821 is a wasteful number, since it uses less digits than its factorization.

2542669821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234161 (or 234158 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 2542669821 is about 50424.8928704861. The cubic root of 2542669821 is about 1364.8868706307.

The spelling of 2542669821 in words is "two billion, five hundred forty-two million, six hundred sixty-nine thousand, eight hundred twenty-one".