121211020320 has 96 divisors (see below), whose sum is σ = 411185097792. Its totient is φ = 29836557312.

The previous prime is 121211020319. The next prime is 121211020363. The reversal of 121211020320 is 23020112121.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×121211020320² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 121211020320.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9706182 + ... + 9718661.

It is an arithmetic number, because the mean of its divisors is an integer number (4283178102).

Almost surely, 2^121211020320 is an apocalyptic number.

121211020320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121211020320 is an abundant number, since it is smaller than the sum of its proper divisors (289974077472).

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

121211020320 is a wasteful number, since it uses less digits than its factorization.

121211020320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19424874 (or 19424866 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 121211020320 its reverse (23020112121), we get a palindrome (144231132441).

The spelling of 121211020320 in words is "one hundred twenty-one billion, two hundred eleven million, twenty thousand, three hundred twenty".