21021142103 has 16 divisors (see below), whose sum is σ = 23198011200. Its totient is φ = 18924568320.

The previous prime is 21021142097. The next prime is 21021142117. The reversal of 21021142103 is 30124112012.

It is a cyclic number.

It is not a de Polignac number, because 21021142103 - 2¹⁰ = 21021141079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021142193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2489693 + ... + 2498121.

It is an arithmetic number, because the mean of its divisors is an integer number (1449875700).

Almost surely, 2^21021142103 is an apocalyptic number.

21021142103 is a deficient number, since it is larger than the sum of its proper divisors (2176869097).

21021142103 is a wasteful number, since it uses less digits than its factorization.

21021142103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13162.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21021142103 its reverse (30124112012), we get a palindrome (51145254115).

The spelling of 21021142103 in words is "twenty-one billion, twenty-one million, one hundred forty-two thousand, one hundred three".