1221001442331 has 48 divisors (see below), whose sum is σ = 1864446280704. Its totient is φ = 709436376000.

The previous prime is 1221001442293. The next prime is 1221001442357. The reversal of 1221001442331 is 1332441001221.

It is not a de Polignac number, because 1221001442331 - 2¹¹ = 1221001440283 is a prime.

It is a super-2 number, since 2×1221001442331² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221001444331) 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, 697041 + ... + 1711101.

It is an arithmetic number, because the mean of its divisors is an integer number (38842630848).

Almost surely, 2^{1221001442331} is an apocalyptic number.

1221001442331 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1221001442331 is a deficient number, since it is larger than the sum of its proper divisors (643444838373).

1221001442331 is a wasteful number, since it uses less digits than its factorization.

1221001442331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1014224 (or 1014213 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 1221001442331 its reverse (1332441001221), we get a palindrome (2553442443552).

The spelling of 1221001442331 in words is "one trillion, two hundred twenty-one billion, one million, four hundred forty-two thousand, three hundred thirty-one".