30000121020 has 36 divisors (see below), whose sum is σ = 91000367640. Its totient is φ = 8000032224.

The previous prime is 30000121013. The next prime is 30000121027. The reversal of 30000121020 is 2012100003.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (30000121013) and next prime (30000121027).

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×30000121020² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 30000120993 and 30000121011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30000121027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83333490 + ... + 83333849.

It is an arithmetic number, because the mean of its divisors is an integer number (2527787990).

Almost surely, 2^30000121020 is an apocalyptic number.

30000121020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30000121020 is an abundant number, since it is smaller than the sum of its proper divisors (61000246620).

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

30000121020 is a wasteful number, since it uses less digits than its factorization.

30000121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166667354 (or 166667349 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

Adding to 30000121020 its reverse (2012100003), we get a palindrome (32012221023).

The spelling of 30000121020 in words is "thirty billion, one hundred twenty-one thousand, twenty".