21470023552111 has 4 divisors (see below), whose sum is σ = 21478479649000. Its totient is φ = 21461567455224.

The previous prime is 21470023552097. The next prime is 21470023552139. The reversal of 21470023552111 is 11125532007412.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21470023552111 is a prime.

It is a super-2 number, since 2×21470023552111² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21470023552711) 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, 4228044636 + ... + 4228049713.

It is an arithmetic number, because the mean of its divisors is an integer number (5369619912250).

Almost surely, 2^{21470023552111} is an apocalyptic number.

21470023552111 is a deficient number, since it is larger than the sum of its proper divisors (8456096889).

21470023552111 is an equidigital number, since it uses as much as digits as its factorization.

21470023552111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8456096888.

The product of its (nonzero) digits is 16800, while the sum is 34.

Adding to 21470023552111 its reverse (11125532007412), we get a palindrome (32595555559523).

The spelling of 21470023552111 in words is "twenty-one trillion, four hundred seventy billion, twenty-three million, five hundred fifty-two thousand, one hundred eleven".