21152450144 has 36 divisors (see below), whose sum is σ = 48442891644. Its totient is φ = 9065335104.

The previous prime is 21152450129. The next prime is 21152450159. The reversal of 21152450144 is 44105425112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21152450129) and next prime (21152450159).

It is a super-2 number, since 2×21152450144² (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 5 ways as a sum of consecutive naturals, for example, 6743474 + ... + 6746609.

It is an arithmetic number, because the mean of its divisors is an integer number (1345635879).

Almost surely, 2^21152450144 is an apocalyptic number.

It is an amenable number.

21152450144 is an abundant number, since it is smaller than the sum of its proper divisors (27290441500).

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

21152450144 is a wasteful number, since it uses less digits than its factorization.

21152450144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13490107 (or 13490092 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 29.

Adding to 21152450144 its reverse (44105425112), we get a palindrome (65257875256).

The spelling of 21152450144 in words is "twenty-one billion, one hundred fifty-two million, four hundred fifty thousand, one hundred forty-four".