21430103402 has 4 divisors (see below), whose sum is σ = 32145155106. Its totient is φ = 10715051700.

The previous prime is 21430103393. The next prime is 21430103473. The reversal of 21430103402 is 20430103412.

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

It can be written as a sum of positive squares in only one way, i.e., 20715557041 + 714546361 = 143929^2 + 26731^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5357525849 + ... + 5357525852.

Almost surely, 2^21430103402 is an apocalyptic number.

21430103402 is a deficient number, since it is larger than the sum of its proper divisors (10715051704).

21430103402 is a wasteful number, since it uses less digits than its factorization.

21430103402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10715051703.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21430103402 its reverse (20430103412), we get a palindrome (41860206814).

It can be divided in two parts, 2143010 and 3402, that added together give a palindrome (2146412).

The spelling of 21430103402 in words is "twenty-one billion, four hundred thirty million, one hundred three thousand, four hundred two".