21444144131420 has 12 divisors (see below), whose sum is σ = 45032702676024. Its totient is φ = 8577657652560.

The previous prime is 21444144131411. The next prime is 21444144131429. The reversal of 21444144131420 is 2413144144412.

It is an interprime number because it is at equal distance from previous prime (21444144131411) and next prime (21444144131429).

It is a super-2 number, since 2×21444144131420² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21444144131429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 536103603266 + ... + 536103603305.

It is an arithmetic number, because the mean of its divisors is an integer number (3752725223002).

Almost surely, 2^{21444144131420} is an apocalyptic number.

21444144131420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21444144131420 is an abundant number, since it is smaller than the sum of its proper divisors (23588558544604).

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

21444144131420 is a wasteful number, since it uses less digits than its factorization.

21444144131420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1072207206580 (or 1072207206578 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 35.

Adding to 21444144131420 its reverse (2413144144412), we get a palindrome (23857288275832).

The spelling of 21444144131420 in words is "twenty-one trillion, four hundred forty-four billion, one hundred forty-four million, one hundred thirty-one thousand, four hundred twenty".