4196639044921 has 2 divisors, whose sum is σ = 4196639044922. Its totient is φ = 4196639044920.

The previous prime is 4196639044861. The next prime is 4196639044991. The reversal of 4196639044921 is 1294409366914.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3011075210025 + 1185563834896 = 1735245^2 + 1088836^2 .

It is a cyclic number.

It is not a de Polignac number, because 4196639044921 - 2¹³ = 4196639036729 is a prime.

It is a super-2 number, since 2×4196639044921² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (4196639044991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2098319522460 + 2098319522461.

It is an arithmetic number, because the mean of its divisors is an integer number (2098319522461).

Almost surely, 2^{4196639044921} is an apocalyptic number.

It is an amenable number.

4196639044921 is a deficient number, since it is larger than the sum of its proper divisors (1).

4196639044921 is an equidigital number, since it uses as much as digits as its factorization.

4196639044921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10077696, while the sum is 58.

The spelling of 4196639044921 in words is "four trillion, one hundred ninety-six billion, six hundred thirty-nine million, forty-four thousand, nine hundred twenty-one".