55121100330 has 64 divisors (see below), whose sum is σ = 134319057408. Its totient is φ = 14473757760.

The previous prime is 55121100319. The next prime is 55121100337. The reversal of 55121100330 is 3300112155.

It is a super-2 number, since 2×55121100330² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55121100297 and 55121100306.

It is not an unprimeable number, because it can be changed into a prime (55121100337) 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, 7640425 + ... + 7647635.

It is an arithmetic number, because the mean of its divisors is an integer number (2098735272).

Almost surely, 2^55121100330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55121100330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67159528704).

55121100330 is an abundant number, since it is smaller than the sum of its proper divisors (79197957078).

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

55121100330 is a wasteful number, since it uses less digits than its factorization.

55121100330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11091.

The product of its (nonzero) digits is 450, while the sum is 21.

Adding to 55121100330 its reverse (3300112155), we get a palindrome (58421212485).

The spelling of 55121100330 in words is "fifty-five billion, one hundred twenty-one million, one hundred thousand, three hundred thirty".