21006531035 has 24 divisors (see below), whose sum is σ = 29332943280. Its totient is φ = 14399792064.

The previous prime is 21006531019. The next prime is 21006531047. The reversal of 21006531035 is 53013560012.

It is not a de Polignac number, because 21006531035 - 2⁴ = 21006531019 is a prime.

It is a super-2 number, since 2×21006531035² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21006530995 and 21006531013.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 849476 + ... + 873854.

It is an arithmetic number, because the mean of its divisors is an integer number (1222205970).

Almost surely, 2^21006531035 is an apocalyptic number.

21006531035 is a deficient number, since it is larger than the sum of its proper divisors (8326412245).

21006531035 is a wasteful number, since it uses less digits than its factorization.

21006531035 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27915 (or 27908 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 26.

The spelling of 21006531035 in words is "twenty-one billion, six million, five hundred thirty-one thousand, thirty-five".