21226020052 has 12 divisors (see below), whose sum is σ = 37299667636. Its totient is φ = 10568972160.

The previous prime is 21226020047. The next prime is 21226020073. The reversal of 21226020052 is 25002062212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5661960516 + 15564059536 = 75246^2 + 124756^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11008383 + ... + 11010310.

Almost surely, 2^21226020052 is an apocalyptic number.

It is an amenable number.

21226020052 is a deficient number, since it is larger than the sum of its proper divisors (16073647584).

21226020052 is a wasteful number, since it uses less digits than its factorization.

21226020052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22018938 (or 22018936 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 21226020052 its reverse (25002062212), we get a palindrome (46228082264).

The spelling of 21226020052 in words is "twenty-one billion, two hundred twenty-six million, twenty thousand, fifty-two".