21232420102 has 16 divisors (see below), whose sum is σ = 32244292080. Its totient is φ = 10484603008.

The previous prime is 21232420091. The next prime is 21232420117. The reversal of 21232420102 is 20102423212.

It is a self number, because there is not a number n which added to its sum of digits gives 21232420102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82953 + ... + 222139.

It is an arithmetic number, because the mean of its divisors is an integer number (2015268255).

Almost surely, 2^21232420102 is an apocalyptic number.

21232420102 is a deficient number, since it is larger than the sum of its proper divisors (11011871978).

21232420102 is a wasteful number, since it uses less digits than its factorization.

21232420102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140135.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21232420102 its reverse (20102423212), we get a palindrome (41334843314).

The spelling of 21232420102 in words is "twenty-one billion, two hundred thirty-two million, four hundred twenty thousand, one hundred two".