19621850426 has 4 divisors (see below), whose sum is σ = 29432775642. Its totient is φ = 9810925212.

The previous prime is 19621850407. The next prime is 19621850441. The reversal of 19621850426 is 62405812691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62405812691 = 76463 ⋅816157.

It can be written as a sum of positive squares in only one way, i.e., 19567813225 + 54037201 = 139885^2 + 7351^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4905462605 + ... + 4905462608.

Almost surely, 2^19621850426 is an apocalyptic number.

19621850426 is a deficient number, since it is larger than the sum of its proper divisors (9810925216).

19621850426 is an equidigital number, since it uses as much as digits as its factorization.

19621850426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9810925215.

The product of its (nonzero) digits is 207360, while the sum is 44.

The spelling of 19621850426 in words is "nineteen billion, six hundred twenty-one million, eight hundred fifty thousand, four hundred twenty-six".