1406120021261 has 2 divisors, whose sum is σ = 1406120021262. Its totient is φ = 1406120021260.

The previous prime is 1406120021249. The next prime is 1406120021279. The reversal of 1406120021261 is 1621200216041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1388876392036 + 17243629225 = 1178506^2 + 131315^2 .

It is a cyclic number.

It is not a de Polignac number, because 1406120021261 - 2⁶ = 1406120021197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1406120021261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1406120021561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 703060010630 + 703060010631.

It is an arithmetic number, because the mean of its divisors is an integer number (703060010631).

Almost surely, 2^{1406120021261} is an apocalyptic number.

It is an amenable number.

1406120021261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1406120021261 is an equidigital number, since it uses as much as digits as its factorization.

1406120021261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 26.

The spelling of 1406120021261 in words is "one trillion, four hundred six billion, one hundred twenty million, twenty-one thousand, two hundred sixty-one".