21353957026 has 8 divisors (see below), whose sum is σ = 32158549584. Its totient is φ = 10634440500.

The previous prime is 21353957021. The next prime is 21353957029. The reversal of 21353957026 is 62075935312.

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

It is not an unprimeable number, because it can be changed into a prime (21353957021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21268380 + ... + 21269383.

It is an arithmetic number, because the mean of its divisors is an integer number (4019818698).

Almost surely, 2^21353957026 is an apocalyptic number.

21353957026 is a deficient number, since it is larger than the sum of its proper divisors (10804592558).

21353957026 is a wasteful number, since it uses less digits than its factorization.

21353957026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42538016.

The product of its (nonzero) digits is 340200, while the sum is 43.

The spelling of 21353957026 in words is "twenty-one billion, three hundred fifty-three million, nine hundred fifty-seven thousand, twenty-six".