121021320030 has 64 divisors (see below), whose sum is σ = 313267445568. Its totient is φ = 29744732160.

The previous prime is 121021320023. The next prime is 121021320037. The reversal of 121021320030 is 30023120121.

It is an interprime number because it is at equal distance from previous prime (121021320023) and next prime (121021320037).

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

It is a junction number, because it is equal to n+sod(n) for n = 121021319991 and 121021320009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121021320037) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23062 + ... + 492518.

It is an arithmetic number, because the mean of its divisors is an integer number (4894803837).

Almost surely, 2^121021320030 is an apocalyptic number.

121021320030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121021320030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156633722784).

121021320030 is an abundant number, since it is smaller than the sum of its proper divisors (192246125538).

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

121021320030 is a wasteful number, since it uses less digits than its factorization.

121021320030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470141.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 121021320030 its reverse (30023120121), we get a palindrome (151044440151).

The spelling of 121021320030 in words is "one hundred twenty-one billion, twenty-one million, three hundred twenty thousand, thirty".