21441421240 has 32 divisors (see below), whose sum is σ = 48339154080. Its totient is φ = 8559509632.

The previous prime is 21441421189. The next prime is 21441421259. The reversal of 21441421240 is 4212414412.

It is a happy number.

It is a super-2 number, since 2×21441421240² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 512719 + ... + 552958.

It is an arithmetic number, because the mean of its divisors is an integer number (1510598565).

Almost surely, 2^21441421240 is an apocalyptic number.

21441421240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21441421240 is an abundant number, since it is smaller than the sum of its proper divisors (26897732840).

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

21441421240 is a wasteful number, since it uses less digits than its factorization.

21441421240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1066191 (or 1066187 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 25.

Adding to 21441421240 its reverse (4212414412), we get a palindrome (25653835652).

The spelling of 21441421240 in words is "twenty-one billion, four hundred forty-one million, four hundred twenty-one thousand, two hundred forty".