21028756026107 has 12 divisors (see below), whose sum is σ = 22616522096520. Its totient is φ = 19498107452256.

The previous prime is 21028756026053. The next prime is 21028756026119. The reversal of 21028756026107 is 70162065782012.

It is not a de Polignac number, because 21028756026107 - 2⁶ = 21028756026043 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21028756026007) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 250473338 + ... + 250557279.

It is an arithmetic number, because the mean of its divisors is an integer number (1884710174710).

Almost surely, 2^{21028756026107} is an apocalyptic number.

21028756026107 is a deficient number, since it is larger than the sum of its proper divisors (1587766070413).

21028756026107 is an equidigital number, since it uses as much as digits as its factorization.

21028756026107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501030730 (or 501030683 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 47.

The spelling of 21028756026107 in words is "twenty-one trillion, twenty-eight billion, seven hundred fifty-six million, twenty-six thousand, one hundred seven".