2072121645 has 16 divisors (see below), whose sum is σ = 3616794432. Its totient is φ = 1004664960.

The previous prime is 2072121641. The next prime is 2072121677. The reversal of 2072121645 is 5461212702.

It is not a de Polignac number, because 2072121645 - 2² = 2072121641 is a prime.

It is a super-3 number, since 3×2072121645³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2072121641) 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, 6278992 + ... + 6279321.

It is an arithmetic number, because the mean of its divisors is an integer number (226049652).

Almost surely, 2^2072121645 is an apocalyptic number.

It is an amenable number.

2072121645 is a deficient number, since it is larger than the sum of its proper divisors (1544672787).

2072121645 is a wasteful number, since it uses less digits than its factorization.

2072121645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12558332.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 2072121645 is about 45520.5628809662. The cubic root of 2072121645 is about 1274.8871657164.

The spelling of 2072121645 in words is "two billion, seventy-two million, one hundred twenty-one thousand, six hundred forty-five".