2021669156 has 12 divisors (see below), whose sum is σ = 3810068892. Its totient is φ = 933078048.

The previous prime is 2021669131. The next prime is 2021669197. The reversal of 2021669156 is 6519661202.

It can be written as a sum of positive squares in 2 ways, for example, as 1199929600 + 821739556 = 34640^2 + 28666^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19439075 + ... + 19439178.

It is an arithmetic number, because the mean of its divisors is an integer number (317505741).

Almost surely, 2^2021669156 is an apocalyptic number.

2021669156 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

2021669156 is a deficient number, since it is larger than the sum of its proper divisors (1788399736).

2021669156 is a wasteful number, since it uses less digits than its factorization.

2021669156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38878270 (or 38878268 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 2021669156 is about 44962.9753908702. The cubic root of 2021669156 is about 1264.4549524297.

The spelling of 2021669156 in words is "two billion, twenty-one million, six hundred sixty-nine thousand, one hundred fifty-six".