21213030100 has 72 divisors (see below), whose sum is σ = 48897995328. Its totient is φ = 7960204800.

The previous prime is 21213030071. The next prime is 21213030131. The reversal of 21213030100 is 103031212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 508639 + ... + 548761.

It is an arithmetic number, because the mean of its divisors is an integer number (679138824).

Almost surely, 2^21213030100 is an apocalyptic number.

21213030100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21213030100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24448997664).

21213030100 is an abundant number, since it is smaller than the sum of its proper divisors (27684965228).

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

21213030100 is a wasteful number, since it uses less digits than its factorization.

21213030100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40465 (or 40458 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 21213030100 its reverse (103031212), we get a palindrome (21316061312).

The spelling of 21213030100 in words is "twenty-one billion, two hundred thirteen million, thirty thousand, one hundred".