211501942397 has 2 divisors, whose sum is σ = 211501942398. Its totient is φ = 211501942396.

The previous prime is 211501942343. The next prime is 211501942409. The reversal of 211501942397 is 793249105112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125688684676 + 85813257721 = 354526^2 + 292939^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211501942397 is a prime.

It is a super-2 number, since 2×211501942397² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211501242397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105750971198 + 105750971199.

It is an arithmetic number, because the mean of its divisors is an integer number (105750971199).

Almost surely, 2^211501942397 is an apocalyptic number.

It is an amenable number.

211501942397 is a deficient number, since it is larger than the sum of its proper divisors (1).

211501942397 is an equidigital number, since it uses as much as digits as its factorization.

211501942397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 44.

The spelling of 211501942397 in words is "two hundred eleven billion, five hundred one million, nine hundred forty-two thousand, three hundred ninety-seven".