21431423102 has 4 divisors (see below), whose sum is σ = 32147134656. Its totient is φ = 10715711550.

The previous prime is 21431423089. The next prime is 21431423131. The reversal of 21431423102 is 20132413412.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5357855774 + ... + 5357855777.

It is an arithmetic number, because the mean of its divisors is an integer number (8036783664).

Almost surely, 2^21431423102 is an apocalyptic number.

21431423102 is a deficient number, since it is larger than the sum of its proper divisors (10715711554).

21431423102 is a wasteful number, since it uses less digits than its factorization.

21431423102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10715711553.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21431423102 its reverse (20132413412), we get a palindrome (41563836514).

The spelling of 21431423102 in words is "twenty-one billion, four hundred thirty-one million, four hundred twenty-three thousand, one hundred two".