2101821670 has 32 divisors (see below), whose sum is σ = 4160999808. Its totient is φ = 759543168.

The previous prime is 2101821649. The next prime is 2101821671. The reversal of 2101821670 is 761281012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101821671) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165889 + ... + 178108.

It is an arithmetic number, because the mean of its divisors is an integer number (130031244).

Almost surely, 2^2101821670 is an apocalyptic number.

2101821670 is a deficient number, since it is larger than the sum of its proper divisors (2059178138).

2101821670 is a wasteful number, since it uses less digits than its factorization.

2101821670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344064.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 2101821670 is about 45845.6286902034. The cubic root of 2101821670 is about 1280.9493425170.

The spelling of 2101821670 in words is "two billion, one hundred one million, eight hundred twenty-one thousand, six hundred seventy".