1021222640688 has 20 divisors (see below), whose sum is σ = 2638158488568. Its totient is φ = 340407546880.

The previous prime is 1021222640681. The next prime is 1021222640689. The reversal of 1021222640688 is 8860462221201.

It is a super-2 number, since 2×1021222640688² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1021222640681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10637735793 + ... + 10637735888.

Almost surely, 2^{1021222640688} is an apocalyptic number.

It is an amenable number.

1021222640688 is an abundant number, since it is smaller than the sum of its proper divisors (1616935847880).

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

1021222640688 is a wasteful number, since it uses less digits than its factorization.

1021222640688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21275471692 (or 21275471686 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 42.

Adding to 1021222640688 its reverse (8860462221201), we get a palindrome (9881684861889).

The spelling of 1021222640688 in words is "one trillion, twenty-one billion, two hundred twenty-two million, six hundred forty thousand, six hundred eighty-eight".