21002010030 has 48 divisors (see below), whose sum is σ = 55135398240. Its totient is φ = 5546159424.

The previous prime is 21002010023. The next prime is 21002010037. The reversal of 21002010030 is 3001020012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21002010023) and next prime (21002010037).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21002009994 and 21002010021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002010037) 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, 1123525 + ... + 1142064.

It is an arithmetic number, because the mean of its divisors is an integer number (1148654130).

Almost surely, 2^21002010030 is an apocalyptic number.

21002010030 is an abundant number, since it is smaller than the sum of its proper divisors (34133388210).

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

21002010030 is a wasteful number, since it uses less digits than its factorization.

21002010030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2265705 (or 2265702 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

Adding to 21002010030 its reverse (3001020012), we get a palindrome (24003030042).

The spelling of 21002010030 in words is "twenty-one billion, two million, ten thousand, thirty".