21210122024 has 128 divisors (see below), whose sum is σ = 50307747840. Its totient is φ = 8159761152.

The previous prime is 21210121997. The next prime is 21210122113. The reversal of 21210122024 is 42022101212.

It is a junction number, because it is equal to n+sod(n) for n = 21210121993 and 21210122011.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5575307 + ... + 5579109.

It is an arithmetic number, because the mean of its divisors is an integer number (393029280).

Almost surely, 2^21210122024 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21210122024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25153873920).

21210122024 is an abundant number, since it is smaller than the sum of its proper divisors (29097625816).

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

21210122024 is a wasteful number, since it uses less digits than its factorization.

21210122024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4039 (or 4035 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21210122024 its reverse (42022101212), we get a palindrome (63232223236).

The spelling of 21210122024 in words is "twenty-one billion, two hundred ten million, one hundred twenty-two thousand, twenty-four".