19700428521 has 8 divisors (see below), whose sum is σ = 27649724320. Its totient is φ = 12442375872.

The previous prime is 19700428519. The next prime is 19700428621. The reversal of 19700428521 is 12582400791.

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

It is not a de Polignac number, because 19700428521 - 2¹ = 19700428519 is a prime.

It is a super-2 number, since 2×19700428521² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19700428521.

It is not an unprimeable number, because it can be changed into a prime (19700428621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172810720 + ... + 172810833.

It is an arithmetic number, because the mean of its divisors is an integer number (3456215540).

Almost surely, 2^19700428521 is an apocalyptic number.

It is an amenable number.

19700428521 is a deficient number, since it is larger than the sum of its proper divisors (7949295799).

19700428521 is a wasteful number, since it uses less digits than its factorization.

19700428521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345621575.

The product of its (nonzero) digits is 40320, while the sum is 39.

The spelling of 19700428521 in words is "nineteen billion, seven hundred million, four hundred twenty-eight thousand, five hundred twenty-one".