31466151221 has 2 divisors, whose sum is σ = 31466151222. Its totient is φ = 31466151220.

The previous prime is 31466151209. The next prime is 31466151239. The reversal of 31466151221 is 12215166413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30196012900 + 1270138321 = 173770^2 + 35639^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31466151221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31466157221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15733075610 + 15733075611.

It is an arithmetic number, because the mean of its divisors is an integer number (15733075611).

Almost surely, 2^31466151221 is an apocalyptic number.

It is an amenable number.

31466151221 is a deficient number, since it is larger than the sum of its proper divisors (1).

31466151221 is an equidigital number, since it uses as much as digits as its factorization.

31466151221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 32.

The spelling of 31466151221 in words is "thirty-one billion, four hundred sixty-six million, one hundred fifty-one thousand, two hundred twenty-one".