21220500016 has 20 divisors (see below), whose sum is σ = 41513894032. Its totient is φ = 10507237056.

The previous prime is 21220500001. The next prime is 21220500101. The reversal of 21220500016 is 61000502212.

It is a junction number, because it is equal to n+sod(n) for n = 21220499966 and 21220500002.

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, 6436611 + ... + 6439906.

Almost surely, 2^21220500016 is an apocalyptic number.

It is an amenable number.

21220500016 is a deficient number, since it is larger than the sum of its proper divisors (20293394016).

21220500016 is a wasteful number, since it uses less digits than its factorization.

21220500016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12876628 (or 12876622 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The spelling of 21220500016 in words is "twenty-one billion, two hundred twenty million, five hundred thousand, sixteen".