21220353126 has 48 divisors (see below), whose sum is σ = 53136064800. Its totient is φ = 5994831744.

The previous prime is 21220353103. The next prime is 21220353131. The reversal of 21220353126 is 62135302212.

It is a happy number.

21220353126 is a `hidden beast` number, since 2 + 122 + 0 + 3 + 531 + 2 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 21220353126.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 934941 + ... + 957368.

It is an arithmetic number, because the mean of its divisors is an integer number (1107001350).

Almost surely, 2^21220353126 is an apocalyptic number.

21220353126 is an abundant number, since it is smaller than the sum of its proper divisors (31915711674).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21220353126 is a wasteful number, since it uses less digits than its factorization.

21220353126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1892413 (or 1892410 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 21220353126 its reverse (62135302212), we get a palindrome (83355655338).

The spelling of 21220353126 in words is "twenty-one billion, two hundred twenty million, three hundred fifty-three thousand, one hundred twenty-six".