21102026452 has 24 divisors (see below), whose sum is σ = 40739188392. Its totient is φ = 9501849600.

The previous prime is 21102026333. The next prime is 21102026459. The reversal of 21102026452 is 25462020112.

It can be written as a sum of positive squares in 4 ways, for example, as 1444304016 + 19657722436 = 38004^2 + 140206^2 .

It is a congruent number.

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, 4946749 + ... + 4951012.

It is an arithmetic number, because the mean of its divisors is an integer number (1697466183).

Almost surely, 2^21102026452 is an apocalyptic number.

It is an amenable number.

21102026452 is a deficient number, since it is larger than the sum of its proper divisors (19637161940).

21102026452 is a wasteful number, since it uses less digits than its factorization.

21102026452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9897819 (or 9897817 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 21102026452 its reverse (25462020112), we get a palindrome (46564046564).

The spelling of 21102026452 in words is "twenty-one billion, one hundred two million, twenty-six thousand, four hundred fifty-two".