1221213221030 has 64 divisors (see below), whose sum is σ = 2440793088000. Its totient is φ = 436169502720.

The previous prime is 1221213221021. The next prime is 1221213221051. The reversal of 1221213221030 is 301223121221.

It is a junction number, because it is equal to n+sod(n) for n = 1221213220993 and 1221213221011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7401371 + ... + 7564569.

It is an arithmetic number, because the mean of its divisors is an integer number (38137392000).

Almost surely, 2^{1221213221030} is an apocalyptic number.

1221213221030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221213221030 is a deficient number, since it is larger than the sum of its proper divisors (1219579866970).

1221213221030 is a wasteful number, since it uses less digits than its factorization.

1221213221030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164429.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 1221213221030 its reverse (301223121221), we get a palindrome (1522436342251).

The spelling of 1221213221030 in words is "one trillion, two hundred twenty-one billion, two hundred thirteen million, two hundred twenty-one thousand, thirty".