21011012109998 has 32 divisors (see below), whose sum is σ = 32082177600000. Its totient is φ = 10317305846016.

The previous prime is 21011012109947. The next prime is 21011012110051. The reversal of 21011012109998 is 89990121011012.

It is a happy number.

It is a congruent number.

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, 1173593915 + ... + 1173611817.

It is an arithmetic number, because the mean of its divisors is an integer number (1002568050000).

Almost surely, 2^{21011012109998} is an apocalyptic number.

21011012109998 is a deficient number, since it is larger than the sum of its proper divisors (11071165490002).

21011012109998 is a wasteful number, since it uses less digits than its factorization.

21011012109998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27176.

The product of its (nonzero) digits is 23328, while the sum is 44.

The spelling of 21011012109998 in words is "twenty-one trillion, eleven billion, twelve million, one hundred nine thousand, nine hundred ninety-eight".