21442023402356 has 12 divisors (see below), whose sum is σ = 37610200405092. Its totient is φ = 10696251858048.

The previous prime is 21442023402337. The next prime is 21442023402361. The reversal of 21442023402356 is 65320432024412.

It can be written as a sum of positive squares in 2 ways, for example, as 4223805936100 + 17218217466256 = 2055190^2 + 4149484^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6189958835 + ... + 6189962298.

It is an arithmetic number, because the mean of its divisors is an integer number (3134183367091).

Almost surely, 2^{21442023402356} is an apocalyptic number.

It is an amenable number.

21442023402356 is a deficient number, since it is larger than the sum of its proper divisors (16168177002736).

21442023402356 is a wasteful number, since it uses less digits than its factorization.

21442023402356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12379921570 (or 12379921568 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 38.

Adding to 21442023402356 its reverse (65320432024412), we get a palindrome (86762455426768).

The spelling of 21442023402356 in words is "twenty-one trillion, four hundred forty-two billion, twenty-three million, four hundred two thousand, three hundred fifty-six".