210540162215221 has 2 divisors, whose sum is σ = 210540162215222. Its totient is φ = 210540162215220.

The previous prime is 210540162215213. The next prime is 210540162215239. The reversal of 210540162215221 is 122512261045012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 171559044783025 + 38981117432196 = 13098055^2 + 6243486^2 .

It is a cyclic number.

It is not a de Polignac number, because 210540162215221 - 2³ = 210540162215213 is a prime.

It is a super-2 number, since 2×210540162215221² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210540162285221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105270081107610 + 105270081107611.

It is an arithmetic number, because the mean of its divisors is an integer number (105270081107611).

Almost surely, 2^{210540162215221} is an apocalyptic number.

It is an amenable number.

210540162215221 is a deficient number, since it is larger than the sum of its proper divisors (1).

210540162215221 is an equidigital number, since it uses as much as digits as its factorization.

210540162215221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19200, while the sum is 34.

The spelling of 210540162215221 in words is "two hundred ten trillion, five hundred forty billion, one hundred sixty-two million, two hundred fifteen thousand, two hundred twenty-one".