121316351520 has 384 divisors, whose sum is σ = 471073688064. Its totient is φ = 25556189184.

The previous prime is 121316351491. The next prime is 121316351521. The reversal of 121316351520 is 25153613121.

It is a super-2 number, since 2×121316351520² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (121316351521) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 33762844 + ... + 33766436.

It is an arithmetic number, because the mean of its divisors is an integer number (1226754396).

Almost surely, 2^121316351520 is an apocalyptic number.

121316351520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121316351520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235536844032).

121316351520 is an abundant number, since it is smaller than the sum of its proper divisors (349757336544).

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

121316351520 is a wasteful number, since it uses less digits than its factorization.

121316351520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4404 (or 4396 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

Adding to 121316351520 its reverse (25153613121), we get a palindrome (146469964641).

The spelling of 121316351520 in words is "one hundred twenty-one billion, three hundred sixteen million, three hundred fifty-one thousand, five hundred twenty".