2100372821 has 8 divisors (see below), whose sum is σ = 2231524920. Its totient is φ = 1973135808.

The previous prime is 2100372817. The next prime is 2100372829. The reversal of 2100372821 is 1282730012.

It can be written as a sum of positive squares in 4 ways, for example, as 1264584721 + 835788100 = 35561^2 + 28910^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2100372821 - 2² = 2100372817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100372829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 977666 + ... + 979811.

It is an arithmetic number, because the mean of its divisors is an integer number (278940615).

Almost surely, 2^2100372821 is an apocalyptic number.

It is an amenable number.

2100372821 is a deficient number, since it is larger than the sum of its proper divisors (131152099).

2100372821 is a wasteful number, since it uses less digits than its factorization.

2100372821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1957543.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 2100372821 is about 45829.8245796337. The cubic root of 2100372821 is about 1280.6549425358.

The spelling of 2100372821 in words is "two billion, one hundred million, three hundred seventy-two thousand, eight hundred twenty-one".