121000021120 has 64 divisors (see below), whose sum is σ = 315562573440. Its totient is φ = 44000005120.

The previous prime is 121000021099. The next prime is 121000021141. The reversal of 121000021120 is 21120000121.

It is an interprime number because it is at equal distance from previous prime (121000021099) and next prime (121000021141).

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×121000021120² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 121000021097 and 121000021106.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8586712 + ... + 8600791.

It is an arithmetic number, because the mean of its divisors is an integer number (4930665210).

Almost surely, 2^121000021120 is an apocalyptic number.

121000021120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121000021120 is an abundant number, since it is smaller than the sum of its proper divisors (194562552320).

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

121000021120 is a wasteful number, since it uses less digits than its factorization.

121000021120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17187533 (or 17187521 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 121000021120 its reverse (21120000121), we get a palindrome (142120021241).

The spelling of 121000021120 in words is "one hundred twenty-one billion, twenty-one thousand, one hundred twenty".