21210020106 has 64 divisors (see below), whose sum is σ = 46550384640. Its totient is φ = 6389328960.

The previous prime is 21210020053. The next prime is 21210020129. The reversal of 21210020106 is 60102001212.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17145720 + ... + 17146956.

It is an arithmetic number, because the mean of its divisors is an integer number (727349760).

Almost surely, 2^21210020106 is an apocalyptic number.

21210020106 is an abundant number, since it is smaller than the sum of its proper divisors (25340364534).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21210020106 is a wasteful number, since it uses less digits than its factorization.

21210020106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2579.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21210020106 its reverse (60102001212), we get a palindrome (81312021318).

The spelling of 21210020106 in words is "twenty-one billion, two hundred ten million, twenty thousand, one hundred six".