21030213529 has 8 divisors (see below), whose sum is σ = 22649265800. Its totient is φ = 19411353216.

The previous prime is 21030213521. The next prime is 21030213559. The reversal of 21030213529 is 92531203012.

It can be written as a sum of positive squares in 4 ways, for example, as 2384857225 + 18645356304 = 48835^2 + 136548^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21030213529 - 2³ = 21030213521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21030213497 and 21030213506.

It is not an unprimeable number, because it can be changed into a prime (21030213521) 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, 246547 + ... + 320695.

It is an arithmetic number, because the mean of its divisors is an integer number (2831158225).

Almost surely, 2^21030213529 is an apocalyptic number.

It is an amenable number.

21030213529 is a deficient number, since it is larger than the sum of its proper divisors (1619052271).

21030213529 is a wasteful number, since it uses less digits than its factorization.

21030213529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95979.

The product of its (nonzero) digits is 3240, while the sum is 28.

The spelling of 21030213529 in words is "twenty-one billion, thirty million, two hundred thirteen thousand, five hundred twenty-nine".