21503250026 has 16 divisors (see below), whose sum is σ = 33707228544. Its totient is φ = 10278147264.

The previous prime is 21503250011. The next prime is 21503250031. The reversal of 21503250026 is 62005230512.

It is a junction number, because it is equal to n+sod(n) for n = 21503249977 and 21503250004.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2655935 + ... + 2664018.

It is an arithmetic number, because the mean of its divisors is an integer number (2106701784).

Almost surely, 2^21503250026 is an apocalyptic number.

21503250026 is a deficient number, since it is larger than the sum of its proper divisors (12203978518).

21503250026 is a wasteful number, since it uses less digits than its factorization.

21503250026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5320045.

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 21503250026 its reverse (62005230512), we get a palindrome (83508480538).

The spelling of 21503250026 in words is "twenty-one billion, five hundred three million, two hundred fifty thousand, twenty-six".