121011221016 has 48 divisors (see below), whose sum is σ = 374558542800. Its totient is φ = 34574634432.

The previous prime is 121011221003. The next prime is 121011221033. The reversal of 121011221016 is 610122110121.

It is a super-2 number, since 2×121011221016² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 121011221016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 120050311 + ... + 120051318.

It is an arithmetic number, because the mean of its divisors is an integer number (7803302975).

Almost surely, 2^121011221016 is an apocalyptic number.

It is an amenable number.

121011221016 is an abundant number, since it is smaller than the sum of its proper divisors (253547321784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121011221016 is a wasteful number, since it uses less digits than its factorization.

121011221016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240101648 (or 240101641 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 121011221016 its reverse (610122110121), we get a palindrome (731133331137).

The spelling of 121011221016 in words is "one hundred twenty-one billion, eleven million, two hundred twenty-one thousand, sixteen".