1001201220987 has 128 divisors (see below), whose sum is σ = 1561339625472. Its totient is φ = 564742886400.

The previous prime is 1001201220961. The next prime is 1001201220997. The reversal of 1001201220987 is 7890221021001.

It is not a de Polignac number, because 1001201220987 - 2⁶ = 1001201220923 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (1001201220907) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1850648937 + ... + 1850649477.

It is an arithmetic number, because the mean of its divisors is an integer number (12197965824).

Almost surely, 2^{1001201220987} is an apocalyptic number.

1001201220987 is a deficient number, since it is larger than the sum of its proper divisors (560138404485).

1001201220987 is a wasteful number, since it uses less digits than its factorization.

1001201220987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1041.

The product of its (nonzero) digits is 4032, while the sum is 33.

Adding to 1001201220987 its reverse (7890221021001), we get a palindrome (8891422241988).

The spelling of 1001201220987 in words is "one trillion, one billion, two hundred one million, two hundred twenty thousand, nine hundred eighty-seven".