21141223444 has 96 divisors (see below), whose sum is σ = 42721281792. Its totient is φ = 9060480000.

The previous prime is 21141223393. The next prime is 21141223457. The reversal of 21141223444 is 44432214112.

It is a super-2 number, since 2×21141223444² (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 31 ways as a sum of consecutive naturals, for example, 40577904 + ... + 40578424.

It is an arithmetic number, because the mean of its divisors is an integer number (445013352).

Almost surely, 2^21141223444 is an apocalyptic number.

It is an amenable number.

21141223444 is an abundant number, since it is smaller than the sum of its proper divisors (21580058348).

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

21141223444 is a wasteful number, since it uses less digits than its factorization.

21141223444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1057 (or 1055 counting only the distinct ones).

The product of its digits is 6144, while the sum is 28.

Adding to 21141223444 its reverse (44432214112), we get a palindrome (65573437556).

The spelling of 21141223444 in words is "twenty-one billion, one hundred forty-one million, two hundred twenty-three thousand, four hundred forty-four".