21203010302123 has 8 divisors (see below), whose sum is σ = 22835572385808. Its totient is φ = 19570671260064.

The previous prime is 21203010302113. The next prime is 21203010302129. The reversal of 21203010302123 is 32120301030212.

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-21203010302123 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21203010302095 and 21203010302104.

It is not an unprimeable number, because it can be changed into a prime (21203010302129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55562936 + ... + 55943237.

It is an arithmetic number, because the mean of its divisors is an integer number (2854446548226).

Almost surely, 2^{21203010302123} is an apocalyptic number.

21203010302123 is a deficient number, since it is larger than the sum of its proper divisors (1632562083685).

21203010302123 is a wasteful number, since it uses less digits than its factorization.

21203010302123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111520813.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21203010302123 its reverse (32120301030212), we get a palindrome (53323311332335).

It can be divided in two parts, 2120301030212 and 3, that multiplied together give a palindrome (6360903090636).

The spelling of 21203010302123 in words is "twenty-one trillion, two hundred three billion, ten million, three hundred two thousand, one hundred twenty-three".