1001211220988 has 48 divisors (see below), whose sum is σ = 1966973234688. Its totient is φ = 442012896000.

The previous prime is 1001211220987. The next prime is 1001211221033. The reversal of 1001211220988 is 8890221121001.

It is a super-2 number, since 2×1001211220988² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001211220987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1576973 + ... + 2118788.

It is an arithmetic number, because the mean of its divisors is an integer number (40978609056).

Almost surely, 2^{1001211220988} is an apocalyptic number.

It is an amenable number.

1001211220988 is a deficient number, since it is larger than the sum of its proper divisors (965762013700).

1001211220988 is a wasteful number, since it uses less digits than its factorization.

1001211220988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3695954 (or 3695952 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 35.

Adding to 1001211220988 its reverse (8890221121001), we get a palindrome (9891432341989).

The spelling of 1001211220988 in words is "one trillion, one billion, two hundred eleven million, two hundred twenty thousand, nine hundred eighty-eight".