21041420510 has 64 divisors (see below), whose sum is σ = 43373159424. Its totient is φ = 7274784000.

The previous prime is 21041420497. The next prime is 21041420513. The reversal of 21041420510 is 1502414012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041420513) 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, 397610 + ... + 447410.

It is an arithmetic number, because the mean of its divisors is an integer number (677705616).

Almost surely, 2^21041420510 is an apocalyptic number.

21041420510 is an abundant number, since it is smaller than the sum of its proper divisors (22331738914).

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

21041420510 is a wasteful number, since it uses less digits than its factorization.

21041420510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50009.

The product of its (nonzero) digits is 320, while the sum is 20.

Adding to 21041420510 its reverse (1502414012), we get a palindrome (22543834522).

The spelling of 21041420510 in words is "twenty-one billion, forty-one million, four hundred twenty thousand, five hundred ten".