21012003030 has 64 divisors (see below), whose sum is σ = 51117454080. Its totient is φ = 5527142784.

The previous prime is 21012003013. The next prime is 21012003031. The reversal of 21012003030 is 3030021012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21012002997 and 21012003015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012003031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 728137 + ... + 756443.

It is an arithmetic number, because the mean of its divisors is an integer number (798710220).

Almost surely, 2^21012003030 is an apocalyptic number.

21012003030 is an abundant number, since it is smaller than the sum of its proper divisors (30105451050).

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

21012003030 is a wasteful number, since it uses less digits than its factorization.

21012003030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28653.

The product of its (nonzero) digits is 36, while the sum is 12.

Adding to 21012003030 its reverse (3030021012), we get a palindrome (24042024042).

The spelling of 21012003030 in words is "twenty-one billion, twelve million, three thousand, thirty".