10211220181 has 2 divisors, whose sum is σ = 10211220182. Its totient is φ = 10211220180.

The previous prime is 10211220127. The next prime is 10211220193. The reversal of 10211220181 is 18102211201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8913059281 + 1298160900 = 94409^2 + 36030^2 .

It is a cyclic number.

It is not a de Polignac number, because 10211220181 - 2¹¹ = 10211218133 is a prime.

It is a super-2 number, since 2×10211220181² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10211220101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5105610090 + 5105610091.

It is an arithmetic number, because the mean of its divisors is an integer number (5105610091).

Almost surely, 2^10211220181 is an apocalyptic number.

It is an amenable number.

10211220181 is a deficient number, since it is larger than the sum of its proper divisors (1).

10211220181 is an equidigital number, since it uses as much as digits as its factorization.

10211220181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 10211220181 its reverse (18102211201), we get a palindrome (28313431382).

The spelling of 10211220181 in words is "ten billion, two hundred eleven million, two hundred twenty thousand, one hundred eighty-one".