3708011111221 has 2 divisors, whose sum is σ = 3708011111222. Its totient is φ = 3708011111220.

The previous prime is 3708011111209. The next prime is 3708011111293. The reversal of 3708011111221 is 1221111108073.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2273671936900 + 1434339174321 = 1507870^2 + 1197639^2 .

It is an emirp because it is prime and its reverse (1221111108073) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3708011111221 - 2³³ = 3699421176629 is a prime.

It is a super-2 number, since 2×3708011111221² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3708011111221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3708011118221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1854005555610 + 1854005555611.

It is an arithmetic number, because the mean of its divisors is an integer number (1854005555611).

Almost surely, 2^{3708011111221} is an apocalyptic number.

It is an amenable number.

3708011111221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3708011111221 is an equidigital number, since it uses as much as digits as its factorization.

3708011111221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 28.

Adding to 3708011111221 its reverse (1221111108073), we get a palindrome (4929122219294).

The spelling of 3708011111221 in words is "three trillion, seven hundred eight billion, eleven million, one hundred eleven thousand, two hundred twenty-one".