2101972 has 6 divisors (see below), whose sum is σ = 3678458. Its totient is φ = 1050984.

The previous prime is 2101961. The next prime is 2102021. The reversal of 2101972 is 2791012.

2101972 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 1089936 + 1012036 = 1044^2 + 1006^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 262743 + ... + 262750.

2^2101972 is an apocalyptic number.

It is an amenable number.

2101972 is a deficient number, since it is larger than the sum of its proper divisors (1576486).

2101972 is a wasteful number, since it uses less digits than its factorization.

2101972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525497 (or 525495 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 2101972 is about 1449.8179196023. The cubic root of 2101972 is about 128.0979881188.

Adding to 2101972 its reverse (2791012), we get a palindrome (4892984).

The spelling of 2101972 in words is "two million, one hundred one thousand, nine hundred seventy-two".