1021221220087 has 2 divisors, whose sum is σ = 1021221220088. Its totient is φ = 1021221220086.

The previous prime is 1021221220069. The next prime is 1021221220133. The reversal of 1021221220087 is 7800221221201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1021221220087 - 2¹⁵ = 1021221187319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021221220037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510610610043 + 510610610044.

It is an arithmetic number, because the mean of its divisors is an integer number (510610610044).

Almost surely, 2^{1021221220087} is an apocalyptic number.

1021221220087 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021221220087 is an equidigital number, since it uses as much as digits as its factorization.

1021221220087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1792, while the sum is 28.

Adding to 1021221220087 its reverse (7800221221201), we get a palindrome (8821442441288).

The spelling of 1021221220087 in words is "one trillion, twenty-one billion, two hundred twenty-one million, two hundred twenty thousand, eighty-seven".