21006526413 has 8 divisors (see below), whose sum is σ = 28028728000. Its totient is φ = 13994337888.

The previous prime is 21006526381. The next prime is 21006526427. The reversal of 21006526413 is 31462560012.

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

It is not a de Polignac number, because 21006526413 - 2⁵ = 21006526381 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 (21006526433) 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 7 ways as a sum of consecutive naturals, for example, 2498368 + ... + 2506761.

It is an arithmetic number, because the mean of its divisors is an integer number (3503591000).

Almost surely, 2^21006526413 is an apocalyptic number.

It is an amenable number.

21006526413 is a deficient number, since it is larger than the sum of its proper divisors (7022201587).

21006526413 is a wasteful number, since it uses less digits than its factorization.

21006526413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5006531.

The product of its (nonzero) digits is 8640, while the sum is 30.

The spelling of 21006526413 in words is "twenty-one billion, six million, five hundred twenty-six thousand, four hundred thirteen".