4021947213157 has 2 divisors, whose sum is σ = 4021947213158. Its totient is φ = 4021947213156.

The previous prime is 4021947213139. The next prime is 4021947213211. The reversal of 4021947213157 is 7513127491204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2915645040676 + 1106302172481 = 1707526^2 + 1051809^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4021947213157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4021947213127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2010973606578 + 2010973606579.

It is an arithmetic number, because the mean of its divisors is an integer number (2010973606579).

Almost surely, 2^{4021947213157} is an apocalyptic number.

It is an amenable number.

4021947213157 is a deficient number, since it is larger than the sum of its proper divisors (1).

4021947213157 is an equidigital number, since it uses as much as digits as its factorization.

4021947213157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 423360, while the sum is 46.

The spelling of 4021947213157 in words is "four trillion, twenty-one billion, nine hundred forty-seven million, two hundred thirteen thousand, one hundred fifty-seven".