21023724243026 has 8 divisors (see below), whose sum is σ = 31535637680640. Its totient is φ = 10511845016148.

The previous prime is 21023724243019. The next prime is 21023724243029. The reversal of 21023724243026 is 62034242732012.

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

It is a super-3 number, since 3×21023724243026³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21023724243029) 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, 6956786 + ... + 9510221.

It is an arithmetic number, because the mean of its divisors is an integer number (3941954710080).

Almost surely, 2^{21023724243026} is an apocalyptic number.

21023724243026 is a deficient number, since it is larger than the sum of its proper divisors (10511913437614).

21023724243026 is a wasteful number, since it uses less digits than its factorization.

21023724243026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17105368.

The product of its (nonzero) digits is 193536, while the sum is 38.

Adding to 21023724243026 its reverse (62034242732012), we get a palindrome (83057966975038).

The spelling of 21023724243026 in words is "twenty-one trillion, twenty-three billion, seven hundred twenty-four million, two hundred forty-three thousand, twenty-six".