21035242250 has 64 divisors (see below), whose sum is σ = 44825654016. Its totient is φ = 7316584000.

The previous prime is 21035242177. The next prime is 21035242253. The reversal of 21035242250 is 5224253012.

It is not an unprimeable number, because it can be changed into a prime (21035242253) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 103037 + ... + 229536.

It is an arithmetic number, because the mean of its divisors is an integer number (700400844).

Almost surely, 2^21035242250 is an apocalyptic number.

21035242250 is an abundant number, since it is smaller than the sum of its proper divisors (23790411766).

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

21035242250 is a wasteful number, since it uses less digits than its factorization.

21035242250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332624 (or 332614 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

Adding to 21035242250 its reverse (5224253012), we get a palindrome (26259495262).

The spelling of 21035242250 in words is "twenty-one billion, thirty-five million, two hundred forty-two thousand, two hundred fifty".