21040353030 has 32 divisors (see below), whose sum is σ = 51861629664. Its totient is φ = 5459118336.

The previous prime is 21040353023. The next prime is 21040353031. The reversal of 21040353030 is 3035304012.

It is a junction number, because it is equal to n+sod(n) for n = 21040352988 and 21040353006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21040353031) 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, 9476527 + ... + 9478746.

It is an arithmetic number, because the mean of its divisors is an integer number (1620675927).

Almost surely, 2^21040353030 is an apocalyptic number.

21040353030 is an abundant number, since it is smaller than the sum of its proper divisors (30821276634).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21040353030 is a wasteful number, since it uses less digits than its factorization.

21040353030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18955320.

The product of its (nonzero) digits is 1080, while the sum is 21.

Adding to 21040353030 its reverse (3035304012), we get a palindrome (24075657042).

The spelling of 21040353030 in words is "twenty-one billion, forty million, three hundred fifty-three thousand, thirty".