21030213530 has 64 divisors (see below), whose sum is σ = 39829045248. Its totient is φ = 7979653440.

The previous prime is 21030213521. The next prime is 21030213559. The reversal of 21030213530 is 3531203012.

It is a super-2 number, since 2×21030213530² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21393419 + ... + 21394401.

It is an arithmetic number, because the mean of its divisors is an integer number (622328832).

Almost surely, 2^21030213530 is an apocalyptic number.

21030213530 is a deficient number, since it is larger than the sum of its proper divisors (18798831718).

21030213530 is a wasteful number, since it uses less digits than its factorization.

21030213530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1691.

The product of its (nonzero) digits is 540, while the sum is 20.

Adding to 21030213530 its reverse (3531203012), we get a palindrome (24561416542).

The spelling of 21030213530 in words is "twenty-one billion, thirty million, two hundred thirteen thousand, five hundred thirty".