21011021110 has 32 divisors (see below), whose sum is σ = 38620000512. Its totient is φ = 8228135520.

The previous prime is 21011021107. The next prime is 21011021113. The reversal of 21011021110 is 1112011012.

It is an interprime number because it is at equal distance from previous prime (21011021107) and next prime (21011021113).

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 (21011021113) 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 15 ways as a sum of consecutive naturals, for example, 13015 + ... + 205405.

It is an arithmetic number, because the mean of its divisors is an integer number (1206875016).

Almost surely, 2^21011021110 is an apocalyptic number.

21011021110 is a deficient number, since it is larger than the sum of its proper divisors (17608979402).

21011021110 is a wasteful number, since it uses less digits than its factorization.

21011021110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192628.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21011021110 its reverse (1112011012), we get a palindrome (22123032122).

The spelling of 21011021110 in words is "twenty-one billion, eleven million, twenty-one thousand, one hundred ten".