906210686221 has 2 divisors, whose sum is σ = 906210686222. Its totient is φ = 906210686220.

The previous prime is 906210686153. The next prime is 906210686341. The reversal of 906210686221 is 122686012609.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 495151468900 + 411059217321 = 703670^2 + 641139^2 .

It is a cyclic number.

It is not a de Polignac number, because 906210686221 - 2⁷ = 906210686093 is a prime.

It is a super-2 number, since 2×906210686221² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (906210684221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 453105343110 + 453105343111.

It is an arithmetic number, because the mean of its divisors is an integer number (453105343111).

Almost surely, 2^906210686221 is an apocalyptic number.

It is an amenable number.

906210686221 is a deficient number, since it is larger than the sum of its proper divisors (1).

906210686221 is an equidigital number, since it uses as much as digits as its factorization.

906210686221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 43.

The spelling of 906210686221 in words is "nine hundred six billion, two hundred ten million, six hundred eighty-six thousand, two hundred twenty-one".