21035245242 has 96 divisors (see below), whose sum is σ = 47598082560. Its totient is φ = 6189004800.

The previous prime is 21035245229. The next prime is 21035245339. The reversal of 21035245242 is 24254253012.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6636234 + ... + 6639402.

It is an arithmetic number, because the mean of its divisors is an integer number (495813360).

Almost surely, 2^21035245242 is an apocalyptic number.

21035245242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21035245242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23799041280).

21035245242 is an abundant number, since it is smaller than the sum of its proper divisors (26562837318).

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

21035245242 is a wasteful number, since it uses less digits than its factorization.

21035245242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3460 (or 3449 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

Adding to 21035245242 its reverse (24254253012), we get a palindrome (45289498254).

The spelling of 21035245242 in words is "twenty-one billion, thirty-five million, two hundred forty-five thousand, two hundred forty-two".