21121443510 has 32 divisors (see below), whose sum is σ = 51261037920. Its totient is φ = 5569099008.

The previous prime is 21121443481. The next prime is 21121443517. The reversal of 21121443510 is 1534412112.

It is a super-2 number, since 2×21121443510² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121443517) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3952657 + ... + 3957996.

It is an arithmetic number, because the mean of its divisors is an integer number (1601907435).

Almost surely, 2^21121443510 is an apocalyptic number.

21121443510 is an abundant number, since it is smaller than the sum of its proper divisors (30139594410).

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

21121443510 is a wasteful number, since it uses less digits than its factorization.

21121443510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7910752.

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 21121443510 its reverse (1534412112), we get a palindrome (22655855622).

The spelling of 21121443510 in words is "twenty-one billion, one hundred twenty-one million, four hundred forty-three thousand, five hundred ten".