2062156721 has 4 divisors (see below), whose sum is σ = 2081075700. Its totient is φ = 2043237744.

The previous prime is 2062156709. The next prime is 2062156741. The reversal of 2062156721 is 1276512602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1349533696 + 712623025 = 36736^2 + 26695^2 .

It is a cyclic number.

It is not a de Polignac number, because 2062156721 - 2³⁰ = 988414897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2062156741) 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, 9459326 + ... + 9459543.

It is an arithmetic number, because the mean of its divisors is an integer number (520268925).

Almost surely, 2^2062156721 is an apocalyptic number.

It is an amenable number.

2062156721 is a deficient number, since it is larger than the sum of its proper divisors (18918979).

2062156721 is a wasteful number, since it uses less digits than its factorization.

2062156721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18918978.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 2062156721 is about 45410.9757767877. The cubic root of 2062156721 is about 1272.8402181230.

The spelling of 2062156721 in words is "two billion, sixty-two million, one hundred fifty-six thousand, seven hundred twenty-one".