21102026450 has 12 divisors (see below), whose sum is σ = 39249769290. Its totient is φ = 8440810560.

The previous prime is 21102026333. The next prime is 21102026459. The reversal of 21102026450 is 5462020112.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 19641181609 + 1460844841 = 140147^2 + 38221^2 .

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 5 ways as a sum of consecutive naturals, for example, 211020215 + ... + 211020314.

Almost surely, 2^21102026450 is an apocalyptic number.

21102026450 is a deficient number, since it is larger than the sum of its proper divisors (18147742840).

21102026450 is a wasteful number, since it uses less digits than its factorization.

21102026450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422040541 (or 422040536 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 21102026450 its reverse (5462020112), we get a palindrome (26564046562).

The spelling of 21102026450 in words is "twenty-one billion, one hundred two million, twenty-six thousand, four hundred fifty".