2101021072 has 20 divisors (see below), whose sum is σ = 4157341056. Its totient is φ = 1028158880.

The previous prime is 2101021049. The next prime is 2101021073. The reversal of 2101021072 is 2701201012.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (2101021073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1396204 + ... + 1397707.

Almost surely, 2^2101021072 is an apocalyptic number.

It is an amenable number.

2101021072 is a deficient number, since it is larger than the sum of its proper divisors (2056319984).

2101021072 is a wasteful number, since it uses less digits than its factorization.

2101021072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2793966 (or 2793960 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 2101021072 is about 45836.8964045342. The cubic root of 2101021072 is about 1280.7866811245.

Adding to 2101021072 its reverse (2701201012), we get a palindrome (4802222084).

The spelling of 2101021072 in words is "two billion, one hundred one million, twenty-one thousand, seventy-two".