2136821828 has 6 divisors (see below), whose sum is σ = 3739438206. Its totient is φ = 1068410912.

The previous prime is 2136821807. The next prime is 2136821837. The reversal of 2136821828 is 8281286312.

It can be written as a sum of positive squares in only one way, i.e., 1284648964 + 852172864 = 35842^2 + 29192^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 267102725 + ... + 267102732.

It is an arithmetic number, because the mean of its divisors is an integer number (623239701).

Almost surely, 2^2136821828 is an apocalyptic number.

It is an amenable number.

2136821828 is a deficient number, since it is larger than the sum of its proper divisors (1602616378).

2136821828 is a wasteful number, since it uses less digits than its factorization.

2136821828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534205461 (or 534205459 counting only the distinct ones).

The product of its digits is 73728, while the sum is 41.

The square root of 2136821828 is about 46225.7701720588. The cubic root of 2136821828 is about 1288.0204857987.

The spelling of 2136821828 in words is "two billion, one hundred thirty-six million, eight hundred twenty-one thousand, eight hundred twenty-eight".