21121101203 has 4 divisors (see below), whose sum is σ = 21165195840. Its totient is φ = 21077006568.

The previous prime is 21121101173. The next prime is 21121101247. The reversal of 21121101203 is 30210112112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21121101203 - 2⁶ = 21121101139 is a prime.

It is a super-2 number, since 2×21121101203² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21121101263) 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, 22046600 + ... + 22047557.

It is an arithmetic number, because the mean of its divisors is an integer number (5291298960).

Almost surely, 2^21121101203 is an apocalyptic number.

21121101203 is a deficient number, since it is larger than the sum of its proper divisors (44094637).

21121101203 is an equidigital number, since it uses as much as digits as its factorization.

21121101203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44094636.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21121101203 its reverse (30210112112), we get a palindrome (51331213315).

The spelling of 21121101203 in words is "twenty-one billion, one hundred twenty-one million, one hundred one thousand, two hundred three".