16221477037 has 2 divisors, whose sum is σ = 16221477038. Its totient is φ = 16221477036.

The previous prime is 16221477029. The next prime is 16221477047. The reversal of 16221477037 is 73077412261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15679797961 + 541679076 = 125219^2 + 23274^2 .

It is a cyclic number.

It is not a de Polignac number, because 16221477037 - 2³ = 16221477029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16221477047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8110738518 + 8110738519.

It is an arithmetic number, because the mean of its divisors is an integer number (8110738519).

Almost surely, 2^16221477037 is an apocalyptic number.

It is an amenable number.

16221477037 is a deficient number, since it is larger than the sum of its proper divisors (1).

16221477037 is an equidigital number, since it uses as much as digits as its factorization.

16221477037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 98784, while the sum is 40.

Adding to 16221477037 its reverse (73077412261), we get a palindrome (89298889298).

The spelling of 16221477037 in words is "sixteen billion, two hundred twenty-one million, four hundred seventy-seven thousand, thirty-seven".