1226870786221 has 2 divisors, whose sum is σ = 1226870786222. Its totient is φ = 1226870786220.

The previous prime is 1226870786149. The next prime is 1226870786261.

1226870786221 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 754057773225 + 472813012996 = 868365^2 + 687614^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 1226870786221 - 2¹⁵ = 1226870753453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1226870786261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 613435393110 + 613435393111.

It is an arithmetic number, because the mean of its divisors is an integer number (613435393111).

Almost surely, 2^{1226870786221} is an apocalyptic number.

It is an amenable number.

1226870786221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1226870786221 is an equidigital number, since it uses as much as digits as its factorization.

1226870786221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1806336, while the sum is 52.

The spelling of 1226870786221 in words is "one trillion, two hundred twenty-six billion, eight hundred seventy million, seven hundred eighty-six thousand, two hundred twenty-one".