21406234702 has 4 divisors (see below), whose sum is σ = 32109352056. Its totient is φ = 10703117350.

The previous prime is 21406234693. The next prime is 21406234721. The reversal of 21406234702 is 20743260412.

It is a happy number.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 5351558674 + ... + 5351558677.

It is an arithmetic number, because the mean of its divisors is an integer number (8027338014).

Almost surely, 2^21406234702 is an apocalyptic number.

21406234702 is a deficient number, since it is larger than the sum of its proper divisors (10703117354).

21406234702 is a wasteful number, since it uses less digits than its factorization.

21406234702 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10703117353.

The product of its (nonzero) digits is 16128, while the sum is 31.

The spelling of 21406234702 in words is "twenty-one billion, four hundred six million, two hundred thirty-four thousand, seven hundred two".