21402525730 has 8 divisors (see below), whose sum is σ = 38524546332. Its totient is φ = 8561010288.

The previous prime is 21402525721. The next prime is 21402525787. The reversal of 21402525730 is 3752520412.

It can be written as a sum of positive squares in 2 ways, for example, as 20841830689 + 560695041 = 144367^2 + 23679^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21402525692 and 21402525701.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1070126277 + ... + 1070126296.

Almost surely, 2^21402525730 is an apocalyptic number.

21402525730 is a deficient number, since it is larger than the sum of its proper divisors (17122020602).

21402525730 is a wasteful number, since it uses less digits than its factorization.

21402525730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2140252580.

The product of its (nonzero) digits is 16800, while the sum is 31.

The spelling of 21402525730 in words is "twenty-one billion, four hundred two million, five hundred twenty-five thousand, seven hundred thirty".