121211020987 has 8 divisors (see below), whose sum is σ = 139871803136. Its totient is φ = 102886469352.

The previous prime is 121211020981. The next prime is 121211021011. The reversal of 121211020987 is 789020112121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121211020987 - 2²³ = 121202632379 is a prime.

It is a super-2 number, since 2×121211020987² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121211020981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84056853 + ... + 84058294.

It is an arithmetic number, because the mean of its divisors is an integer number (17483975392).

Almost surely, 2^121211020987 is an apocalyptic number.

121211020987 is a deficient number, since it is larger than the sum of its proper divisors (18660782149).

121211020987 is a wasteful number, since it uses less digits than its factorization.

121211020987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168115257.

The product of its (nonzero) digits is 4032, while the sum is 34.

The spelling of 121211020987 in words is "one hundred twenty-one billion, two hundred eleven million, twenty thousand, nine hundred eighty-seven".