1221010100987 has 2 divisors, whose sum is σ = 1221010100988. Its totient is φ = 1221010100986.

The previous prime is 1221010100983. The next prime is 1221010101029. The reversal of 1221010100987 is 7890010101221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221010100987 - 2² = 1221010100983 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221010100983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610505050493 + 610505050494.

It is an arithmetic number, because the mean of its divisors is an integer number (610505050494).

Almost surely, 2^{1221010100987} is an apocalyptic number.

1221010100987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221010100987 is an equidigital number, since it uses as much as digits as its factorization.

1221010100987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 32.

The spelling of 1221010100987 in words is "one trillion, two hundred twenty-one billion, ten million, one hundred thousand, nine hundred eighty-seven".