2721330406381 has 2 divisors, whose sum is σ = 2721330406382. Its totient is φ = 2721330406380.

The previous prime is 2721330406363. The next prime is 2721330406393. The reversal of 2721330406381 is 1836040331272.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2066794393225 + 654536013156 = 1437635^2 + 809034^2 .

It is a cyclic number.

It is not a de Polignac number, because 2721330406381 - 2⁹ = 2721330405869 is a prime.

It is a super-2 number, since 2×2721330406381² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2721330406351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1360665203190 + 1360665203191.

It is an arithmetic number, because the mean of its divisors is an integer number (1360665203191).

Almost surely, 2^{2721330406381} is an apocalyptic number.

It is an amenable number.

2721330406381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2721330406381 is an equidigital number, since it uses as much as digits as its factorization.

2721330406381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 40.

The spelling of 2721330406381 in words is "two trillion, seven hundred twenty-one billion, three hundred thirty million, four hundred six thousand, three hundred eighty-one".