19621449026 has 16 divisors (see below), whose sum is σ = 29529701496. Its totient is φ = 9778269696.

The previous prime is 19621449013. The next prime is 19621449031. The reversal of 19621449026 is 62094412691.

It can be written as a sum of positive squares in 4 ways, for example, as 19211346025 + 410103001 = 138605^2 + 20251^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 741170 + ... + 767186.

Almost surely, 2^19621449026 is an apocalyptic number.

19621449026 is a deficient number, since it is larger than the sum of its proper divisors (9908252470).

19621449026 is a wasteful number, since it uses less digits than its factorization.

19621449026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27253.

The product of its (nonzero) digits is 186624, while the sum is 44.

The spelling of 19621449026 in words is "nineteen billion, six hundred twenty-one million, four hundred forty-nine thousand, twenty-six".