211220993801 has 2 divisors, whose sum is σ = 211220993802. Its totient is φ = 211220993800.

The previous prime is 211220993779. The next prime is 211220993827. The reversal of 211220993801 is 108399022112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123057132025 + 88163861776 = 350795^2 + 296924^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211220993801 is a prime.

It is a super-2 number, since 2×211220993801² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211220993861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105610496900 + 105610496901.

It is an arithmetic number, because the mean of its divisors is an integer number (105610496901).

Almost surely, 2^211220993801 is an apocalyptic number.

It is an amenable number.

211220993801 is a deficient number, since it is larger than the sum of its proper divisors (1).

211220993801 is an equidigital number, since it uses as much as digits as its factorization.

211220993801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 38.

It can be divided in two parts, 211220 and 993801, that added together give a palindrome (1205021).

The spelling of 211220993801 in words is "two hundred eleven billion, two hundred twenty million, nine hundred ninety-three thousand, eight hundred one".