21002134110 has 64 divisors (see below), whose sum is σ = 50933111040. Its totient is φ = 5542168320.

The previous prime is 21002134103. The next prime is 21002134117. The reversal of 21002134110 is 1143120012.

It is an interprime number because it is at equal distance from previous prime (21002134103) and next prime (21002134117).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21002134110.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002134117) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1297165 + ... + 1313255.

It is an arithmetic number, because the mean of its divisors is an integer number (795829860).

Almost surely, 2^21002134110 is an apocalyptic number.

21002134110 is an abundant number, since it is smaller than the sum of its proper divisors (29930976930).

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

21002134110 is a wasteful number, since it uses less digits than its factorization.

21002134110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16553.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21002134110 its reverse (1143120012), we get a palindrome (22145254122).

The spelling of 21002134110 in words is "twenty-one billion, two million, one hundred thirty-four thousand, one hundred ten".