1210021121987 has 4 divisors (see below), whose sum is σ = 1217266757616. Its totient is φ = 1202775486360.

The previous prime is 1210021121957. The next prime is 1210021122017. The reversal of 1210021121987 is 7891211200121.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1210021121957) and next prime (1210021122017).

It is a cyclic number.

It is not a de Polignac number, because 1210021121987 - 2¹⁰ = 1210021120963 is a prime.

It is a super-2 number, since 2×1210021121987² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1210021121957) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3622817564 + ... + 3622817897.

It is an arithmetic number, because the mean of its divisors is an integer number (304316689404).

Almost surely, 2^{1210021121987} is an apocalyptic number.

1210021121987 is a deficient number, since it is larger than the sum of its proper divisors (7245635629).

1210021121987 is an equidigital number, since it uses as much as digits as its factorization.

1210021121987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7245635628.

The product of its (nonzero) digits is 4032, while the sum is 35.

The spelling of 1210021121987 in words is "one trillion, two hundred ten billion, twenty-one million, one hundred twenty-one thousand, nine hundred eighty-seven".