21423031102 has 32 divisors (see below), whose sum is σ = 35917188480. Its totient is φ = 9500543520.

The previous prime is 21423031087. The next prime is 21423031121. The reversal of 21423031102 is 20113032412.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21423031102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157393 + ... + 260035.

It is an arithmetic number, because the mean of its divisors is an integer number (1122412140).

Almost surely, 2^21423031102 is an apocalyptic number.

21423031102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21423031102 is a deficient number, since it is larger than the sum of its proper divisors (14494157378).

21423031102 is a wasteful number, since it uses less digits than its factorization.

21423031102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102888.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21423031102 its reverse (20113032412), we get a palindrome (41536063514).

The spelling of 21423031102 in words is "twenty-one billion, four hundred twenty-three million, thirty-one thousand, one hundred two".