201690424321 has 2 divisors, whose sum is σ = 201690424322. Its totient is φ = 201690424320.

The previous prime is 201690424267. The next prime is 201690424343. The reversal of 201690424321 is 123424096102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121216081921 + 80474342400 = 348161^2 + 283680^2 .

It is a cyclic number.

It is not a de Polignac number, because 201690424321 - 2¹¹ = 201690422273 is a prime.

It is a super-2 number, since 2×201690424321² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (201690424381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100845212160 + 100845212161.

It is an arithmetic number, because the mean of its divisors is an integer number (100845212161).

Almost surely, 2^201690424321 is an apocalyptic number.

It is an amenable number.

201690424321 is a deficient number, since it is larger than the sum of its proper divisors (1).

201690424321 is an equidigital number, since it uses as much as digits as its factorization.

201690424321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 34.

The spelling of 201690424321 in words is "two hundred one billion, six hundred ninety million, four hundred twenty-four thousand, three hundred twenty-one".