21204212310 has 96 divisors (see below), whose sum is σ = 56883284640. Its totient is φ = 5476723200.

The previous prime is 21204212261. The next prime is 21204212347. The reversal of 21204212310 is 1321240212.

It is a happy number.

21204212310 is a `hidden beast` number, since 2 + 12 + 0 + 421 + 231 + 0 = 666.

It is a super-2 number, since 2×21204212310² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 492240 + ... + 533580.

It is an arithmetic number, because the mean of its divisors is an integer number (592534215).

Almost surely, 2^21204212310 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21204212310, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28441642320).

21204212310 is an abundant number, since it is smaller than the sum of its proper divisors (35679072330).

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

21204212310 is a wasteful number, since it uses less digits than its factorization.

21204212310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41534 (or 41531 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21204212310 its reverse (1321240212), we get a palindrome (22525452522).

The spelling of 21204212310 in words is "twenty-one billion, two hundred four million, two hundred twelve thousand, three hundred ten".