21012115106 has 32 divisors (see below), whose sum is σ = 33643548288. Its totient is φ = 9820096000.

The previous prime is 21012115099. The next prime is 21012115147. The reversal of 21012115106 is 60151121012.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 594770 + ... + 629106.

It is an arithmetic number, because the mean of its divisors is an integer number (1051360884).

Almost surely, 2^21012115106 is an apocalyptic number.

21012115106 is a deficient number, since it is larger than the sum of its proper divisors (12631433182).

21012115106 is a wasteful number, since it uses less digits than its factorization.

21012115106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34666.

The product of its (nonzero) digits is 120, while the sum is 20.

Adding to 21012115106 its reverse (60151121012), we get a palindrome (81163236118).

The spelling of 21012115106 in words is "twenty-one billion, twelve million, one hundred fifteen thousand, one hundred six".