2121665037 has 16 divisors (see below), whose sum is σ = 2862731520. Its totient is φ = 1397544192.

The previous prime is 2121665033. The next prime is 2121665041. The reversal of 2121665037 is 7305661212.

2121665037 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2121665033) and next prime (2121665041).

It is not a de Polignac number, because 2121665037 - 2² = 2121665033 is a prime.

It is a super-2 number, since 2×2121665037² = 9002925058456422738, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2121664989 and 2121665007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121665033) 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, 632988 + ... + 636330.

It is an arithmetic number, because the mean of its divisors is an integer number (178920720).

Almost surely, 2^2121665037 is an apocalyptic number.

It is an amenable number.

2121665037 is a deficient number, since it is larger than the sum of its proper divisors (741066483).

2121665037 is a wasteful number, since it uses less digits than its factorization.

2121665037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5812.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 2121665037 is about 46061.5353304685. The cubic root of 2121665037 is about 1284.9678840505.

The spelling of 2121665037 in words is "two billion, one hundred twenty-one million, six hundred sixty-five thousand, thirty-seven".