1221042511150 has 96 divisors (see below), whose sum is σ = 2908078728192. Its totient is φ = 370298563200.

The previous prime is 1221042511063. The next prime is 1221042511151. The reversal of 1221042511150 is 511152401221.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221042511151) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4143414 + ... + 4428313.

It is an arithmetic number, because the mean of its divisors is an integer number (30292486752).

Almost surely, 2^{1221042511150} is an apocalyptic number.

1221042511150 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221042511150 is an abundant number, since it is smaller than the sum of its proper divisors (1687036217042).

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

1221042511150 is a wasteful number, since it uses less digits than its factorization.

1221042511150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8571794 (or 8571789 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 25.

Adding to 1221042511150 its reverse (511152401221), we get a palindrome (1732194912371).

The spelling of 1221042511150 in words is "one trillion, two hundred twenty-one billion, forty-two million, five hundred eleven thousand, one hundred fifty".