121213521320 has 64 divisors (see below), whose sum is σ = 273735504000. Its totient is φ = 48306965760.

The previous prime is 121213521301. The next prime is 121213521347. The reversal of 121213521320 is 23125312121.

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, 21928397 + ... + 21933923.

It is an arithmetic number, because the mean of its divisors is an integer number (4277117250).

Almost surely, 2^121213521320 is an apocalyptic number.

121213521320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121213521320 is an abundant number, since it is smaller than the sum of its proper divisors (152521982680).

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

121213521320 is a wasteful number, since it uses less digits than its factorization.

121213521320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7458 (or 7454 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 121213521320 its reverse (23125312121), we get a palindrome (144338833441).

The spelling of 121213521320 in words is "one hundred twenty-one billion, two hundred thirteen million, five hundred twenty-one thousand, three hundred twenty".