21021242110 has 64 divisors (see below), whose sum is σ = 41931566784. Its totient is φ = 7523968000.

The previous prime is 21021242071. The next prime is 21021242113. The reversal of 21021242110 is 1124212012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021242113) 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, 1916562 + ... + 1927498.

It is an arithmetic number, because the mean of its divisors is an integer number (655180731).

Almost surely, 2^21021242110 is an apocalyptic number.

21021242110 is a deficient number, since it is larger than the sum of its proper divisors (20910324674).

21021242110 is a wasteful number, since it uses less digits than its factorization.

21021242110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11229.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21021242110 its reverse (1124212012), we get a palindrome (22145454122).

The spelling of 21021242110 in words is "twenty-one billion, twenty-one million, two hundred forty-two thousand, one hundred ten".