21010532403 has 8 divisors (see below), whose sum is σ = 32016049408. Its totient is φ = 12006018504.

The previous prime is 21010532381. The next prime is 21010532429. The reversal of 21010532403 is 30423501012.

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

It is not a de Polignac number, because 21010532403 - 2⁵ = 21010532371 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 1000501543 = 21010532403 / (2 + 1 + 0 + 1 + 0 + 5 + 3 + 2 + 4 + 0 + 3).

It is a self number, because there is not a number n which added to its sum of digits gives 21010532403.

It is not an unprimeable number, because it can be changed into a prime (21010532483) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 500250751 + ... + 500250792.

It is an arithmetic number, because the mean of its divisors is an integer number (4002006176).

Almost surely, 2^21010532403 is an apocalyptic number.

21010532403 is a deficient number, since it is larger than the sum of its proper divisors (11005517005).

21010532403 is a wasteful number, since it uses less digits than its factorization.

21010532403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000501553.

The product of its (nonzero) digits is 720, while the sum is 21.

The spelling of 21010532403 in words is "twenty-one billion, ten million, five hundred thirty-two thousand, four hundred three".