21021021102112 has 24 divisors (see below), whose sum is σ = 41385241094400. Its totient is φ = 10510483681344.

The previous prime is 21021021102101. The next prime is 21021021102113. The reversal of 21021021102112 is 21120112012012.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (21021021102113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19318089 + ... + 20377207.

It is an arithmetic number, because the mean of its divisors is an integer number (1724385045600).

Almost surely, 2^{21021021102112} is an apocalyptic number.

It is an amenable number.

21021021102112 is a deficient number, since it is larger than the sum of its proper divisors (20364219992288).

21021021102112 is a wasteful number, since it uses less digits than its factorization.

21021021102112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1679368 (or 1679360 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21021021102112 its reverse (21120112012012), we get a palindrome (42141133114124).

The spelling of 21021021102112 in words is "twenty-one trillion, twenty-one billion, twenty-one million, one hundred two thousand, one hundred twelve".