21012222103 has 8 divisors (see below), whose sum is σ = 21227751216. Its totient is φ = 20796840000.

The previous prime is 21012222059. The next prime is 21012222109. The reversal of 21012222103 is 30122221012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21012222103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012222109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 263028 + ... + 333478.

It is an arithmetic number, because the mean of its divisors is an integer number (2653468902).

Almost surely, 2^21012222103 is an apocalyptic number.

21012222103 is a deficient number, since it is larger than the sum of its proper divisors (215529113).

21012222103 is a wasteful number, since it uses less digits than its factorization.

21012222103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73505.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21012222103 its reverse (30122221012), we get a palindrome (51134443115).

The spelling of 21012222103 in words is "twenty-one billion, twelve million, two hundred twenty-two thousand, one hundred three".