1221231000030 has 16 divisors (see below), whose sum is σ = 2930954400144. Its totient is φ = 325661600000.

The previous prime is 1221231000007. The next prime is 1221231000037. The reversal of 1221231000030 is 300001321221.

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 = 1221230999973 and 1221231000009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221231000037) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20353849971 + ... + 20353850030.

It is an arithmetic number, because the mean of its divisors is an integer number (183184650009).

Almost surely, 2^{1221231000030} is an apocalyptic number.

1221231000030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221231000030 is an abundant number, since it is smaller than the sum of its proper divisors (1709723400114).

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

1221231000030 is a wasteful number, since it uses less digits than its factorization.

1221231000030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40707700011.

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

Adding to 1221231000030 its reverse (300001321221), we get a palindrome (1521232321251).

The spelling of 1221231000030 in words is "one trillion, two hundred twenty-one billion, two hundred thirty-one million, thirty", and thus it is an aban number.