21012203030 has 48 divisors (see below), whose sum is σ = 47381377680. Its totient is φ = 6650013888.

The previous prime is 21012203027. The next prime is 21012203039. The reversal of 21012203030 is 3030221012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 21012202996 and 21012203014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012203039) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1642940 + ... + 1655679.

It is an arithmetic number, because the mean of its divisors is an integer number (987112035).

Almost surely, 2^21012203030 is an apocalyptic number.

21012203030 is an abundant number, since it is smaller than the sum of its proper divisors (26369174650).

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

21012203030 is a wasteful number, since it uses less digits than its factorization.

21012203030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3298653 (or 3298646 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21012203030 its reverse (3030221012), we get a palindrome (24042424042).

The spelling of 21012203030 in words is "twenty-one billion, twelve million, two hundred three thousand, thirty".