21102026451 has 8 divisors (see below), whose sum is σ = 30693856704. Its totient is φ = 12789106920.

The previous prime is 21102026333. The next prime is 21102026459. The reversal of 21102026451 is 15462020112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21102026451 - 2⁹ = 21102025939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21102026459) 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, 319727641 + ... + 319727706.

It is an arithmetic number, because the mean of its divisors is an integer number (3836732088).

Almost surely, 2^21102026451 is an apocalyptic number.

21102026451 is a deficient number, since it is larger than the sum of its proper divisors (9591830253).

21102026451 is a wasteful number, since it uses less digits than its factorization.

21102026451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639455361.

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 21102026451 its reverse (15462020112), we get a palindrome (36564046563).

It can be divided in two parts, 2110202 and 6451, that added together give a triangular number (2116653 = T₂₀₅₇).

The spelling of 21102026451 in words is "twenty-one billion, one hundred two million, twenty-six thousand, four hundred fifty-one".