1201021999987 has 2 divisors, whose sum is σ = 1201021999988. Its totient is φ = 1201021999986.

The previous prime is 1201021999943. The next prime is 1201022000029. The reversal of 1201021999987 is 7899991201021.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1201021999987 - 2¹¹ = 1201021997939 is a prime.

It is not a weakly prime, because it can be changed into another prime (1201021991987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600510999993 + 600510999994.

It is an arithmetic number, because the mean of its divisors is an integer number (600510999994).

Almost surely, 2^{1201021999987} is an apocalyptic number.

1201021999987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201021999987 is an equidigital number, since it uses as much as digits as its factorization.

1201021999987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1469664, while the sum is 58.

The spelling of 1201021999987 in words is "one trillion, two hundred one billion, twenty-one million, nine hundred ninety-nine thousand, nine hundred eighty-seven".