2142577821 has 4 divisors (see below), whose sum is σ = 2856770432. Its totient is φ = 1428385212.

The previous prime is 2142577819. The next prime is 2142577837. The reversal of 2142577821 is 1287752412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2142577821 - 2¹ = 2142577819 is a prime.

It is a super-2 number, since 2×2142577821² = 9181279438082216082, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2142577821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2142577891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 357096301 + ... + 357096306.

It is an arithmetic number, because the mean of its divisors is an integer number (714192608).

Almost surely, 2^2142577821 is an apocalyptic number.

It is an amenable number.

2142577821 is a deficient number, since it is larger than the sum of its proper divisors (714192611).

2142577821 is an equidigital number, since it uses as much as digits as its factorization.

2142577821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714192610.

The product of its digits is 62720, while the sum is 39.

The square root of 2142577821 is about 46287.9878694246. The cubic root of 2142577821 is about 1289.1759697393.

The spelling of 2142577821 in words is "two billion, one hundred forty-two million, five hundred seventy-seven thousand, eight hundred twenty-one".