1221011323250 has 32 divisors (see below), whose sum is σ = 2286806805504. Its totient is φ = 488175126000.

The previous prime is 1221011323249. The next prime is 1221011323261. The reversal of 1221011323250 is 523231101221.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 613202 + ... + 1678701.

It is an arithmetic number, because the mean of its divisors is an integer number (71462712672).

Almost surely, 2^{1221011323250} is an apocalyptic number.

1221011323250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221011323250 is a deficient number, since it is larger than the sum of its proper divisors (1065795482254).

1221011323250 is a wasteful number, since it uses less digits than its factorization.

1221011323250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2294051 (or 2294041 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 1221011323250 its reverse (523231101221), we get a palindrome (1744242424471).

The spelling of 1221011323250 in words is "one trillion, two hundred twenty-one billion, eleven million, three hundred twenty-three thousand, two hundred fifty".