21203115043013 has 4 divisors (see below), whose sum is σ = 21364970883168. Its totient is φ = 21041259202860.

The previous prime is 21203115042961. The next prime is 21203115043049. The reversal of 21203115043013 is 31034051130212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21203115043013 - 2²² = 21203110848709 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 (21203115043063) 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, 80927919881 + ... + 80927920142.

It is an arithmetic number, because the mean of its divisors is an integer number (5341242720792).

Almost surely, 2^{21203115043013} is an apocalyptic number.

It is an amenable number.

21203115043013 is a deficient number, since it is larger than the sum of its proper divisors (161855840155).

21203115043013 is a wasteful number, since it uses less digits than its factorization.

21203115043013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161855840154.

The product of its (nonzero) digits is 2160, while the sum is 26.

Adding to 21203115043013 its reverse (31034051130212), we get a palindrome (52237166173225).

The spelling of 21203115043013 in words is "twenty-one trillion, two hundred three billion, one hundred fifteen million, forty-three thousand, thirteen".