21235101426 has 200 divisors, whose sum is σ = 59864217600. Its totient is φ = 5511298320.

The previous prime is 21235101397. The next prime is 21235101431. The reversal of 21235101426 is 62410153212.

21235101426 is a `hidden beast` number, since 2 + 1 + 2 + 3 + 510 + 142 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 21235101426.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 99 ways as a sum of consecutive naturals, for example, 16602255 + ... + 16603533.

It is an arithmetic number, because the mean of its divisors is an integer number (299321088).

Almost surely, 2^21235101426 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21235101426, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29932108800).

21235101426 is an abundant number, since it is smaller than the sum of its proper divisors (38629116174).

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

21235101426 is an equidigital number, since it uses as much as digits as its factorization.

21235101426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344 (or 1302 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

Adding to 21235101426 its reverse (62410153212), we get a palindrome (83645254638).

The spelling of 21235101426 in words is "twenty-one billion, two hundred thirty-five million, one hundred one thousand, four hundred twenty-six".