21420224010 has 96 divisors (see below), whose sum is σ = 58845346560. Its totient is φ = 5604251328.

The previous prime is 21420224003. The next prime is 21420224017. The reversal of 21420224010 is 1042202412.

21420224010 is a `hidden beast` number, since 2 + 1 + 420 + 2 + 240 + 1 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (21420224003) and next prime (21420224017).

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

It is not an unprimeable number, because it can be changed into a prime (21420224017) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 45631 + ... + 211949.

It is an arithmetic number, because the mean of its divisors is an integer number (612972360).

Almost surely, 2^21420224010 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21420224010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29422673280).

21420224010 is an abundant number, since it is smaller than the sum of its proper divisors (37425122550).

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

21420224010 is a wasteful number, since it uses less digits than its factorization.

21420224010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166394 (or 166382 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21420224010 its reverse (1042202412), we get a palindrome (22462426422).

The spelling of 21420224010 in words is "twenty-one billion, four hundred twenty million, two hundred twenty-four thousand, ten".