21030213507 has 16 divisors (see below), whose sum is σ = 29370705408. Its totient is φ = 13359568640.

The previous prime is 21030213499. The next prime is 21030213521. The reversal of 21030213507 is 70531203012.

It is a cyclic number.

It is not a de Polignac number, because 21030213507 - 2³ = 21030213499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21030212507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 561294 + ... + 597587.

It is an arithmetic number, because the mean of its divisors is an integer number (1835669088).

Almost surely, 2^21030213507 is an apocalyptic number.

21030213507 is a deficient number, since it is larger than the sum of its proper divisors (8340491901).

21030213507 is a wasteful number, since it uses less digits than its factorization.

21030213507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1159170.

The product of its (nonzero) digits is 1260, while the sum is 24.

Adding to 21030213507 its reverse (70531203012), we get a palindrome (91561416519).

The spelling of 21030213507 in words is "twenty-one billion, thirty million, two hundred thirteen thousand, five hundred seven".