21535222102 has 4 divisors (see below), whose sum is σ = 32302833156. Its totient is φ = 10767611050.

The previous prime is 21535222099. The next prime is 21535222109. The reversal of 21535222102 is 20122253512.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21535222109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5383805524 + ... + 5383805527.

It is an arithmetic number, because the mean of its divisors is an integer number (8075708289).

Almost surely, 2^21535222102 is an apocalyptic number.

21535222102 is a deficient number, since it is larger than the sum of its proper divisors (10767611054).

21535222102 is a wasteful number, since it uses less digits than its factorization.

21535222102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10767611053.

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 21535222102 its reverse (20122253512), we get a palindrome (41657475614).

The spelling of 21535222102 in words is "twenty-one billion, five hundred thirty-five million, two hundred twenty-two thousand, one hundred two".