21002021110 has 16 divisors (see below), whose sum is σ = 43204157856. Its totient is φ = 7200692928.

The previous prime is 21002021107. The next prime is 21002021113. The reversal of 21002021110 is 1112020012.

It is an interprime number because it is at equal distance from previous prime (21002021107) and next prime (21002021113).

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002021113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150014367 + ... + 150014506.

It is an arithmetic number, because the mean of its divisors is an integer number (2700259866).

Almost surely, 2^21002021110 is an apocalyptic number.

21002021110 is an abundant number, since it is smaller than the sum of its proper divisors (22202136746).

21002021110 is a wasteful number, since it uses less digits than its factorization.

21002021110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300028887.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21002021110 its reverse (1112020012), we get a palindrome (22114041122).

The spelling of 21002021110 in words is "twenty-one billion, two million, twenty-one thousand, one hundred ten".