21202001010 has 384 divisors, whose sum is σ = 63534481920. Its totient is φ = 4873125888.

The previous prime is 21202001003. The next prime is 21202001017. The reversal of 21202001010 is 1010020212.

It is an interprime number because it is at equal distance from previous prime (21202001003) and next prime (21202001017).

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 = 21202000983 and 21202001001.

It is not an unprimeable number, because it can be changed into a prime (21202001017) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 205844619 + ... + 205844721.

It is an arithmetic number, because the mean of its divisors is an integer number (165454380).

Almost surely, 2^21202001010 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21202001010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31767240960).

21202001010 is an abundant number, since it is smaller than the sum of its proper divisors (42332480910).

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

21202001010 is a wasteful number, since it uses less digits than its factorization.

21202001010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322 (or 319 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 21202001010 its reverse (1010020212), we get a palindrome (22212021222).

The spelling of 21202001010 in words is "twenty-one billion, two hundred two million, one thousand, ten".