19621036258 has 4 divisors (see below), whose sum is σ = 29431554390. Its totient is φ = 9810518128.

The previous prime is 19621036247. The next prime is 19621036271. The reversal of 19621036258 is 85263012691.

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., 19178649169 + 442387089 = 138487^2 + 21033^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4905259063 + ... + 4905259066.

Almost surely, 2^19621036258 is an apocalyptic number.

19621036258 is a deficient number, since it is larger than the sum of its proper divisors (9810518132).

19621036258 is an equidigital number, since it uses as much as digits as its factorization.

19621036258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9810518131.

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 19621036258 in words is "nineteen billion, six hundred twenty-one million, thirty-six thousand, two hundred fifty-eight".