100021111001256 has 32 divisors (see below), whose sum is σ = 250135113140640. Its totient is φ = 33329392248768.

The previous prime is 100021111001219. The next prime is 100021111001257. The reversal of 100021111001256 is 652100111120001.

It is not an unprimeable number, because it can be changed into a prime (100021111001257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 686055906 + ... + 686201681.

It is an arithmetic number, because the mean of its divisors is an integer number (7816722285645).

Almost surely, 2^{100021111001256} is an apocalyptic number.

It is an amenable number.

100021111001256 is an abundant number, since it is smaller than the sum of its proper divisors (150114002139384).

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

100021111001256 is a wasteful number, since it uses less digits than its factorization.

100021111001256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1372260633 (or 1372260629 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 21.

Adding to 100021111001256 its reverse (652100111120001), we get a palindrome (752121222121257).

The spelling of 100021111001256 in words is "one hundred trillion, twenty-one billion, one hundred eleven million, one thousand, two hundred fifty-six".