21122153044 has 24 divisors (see below), whose sum is σ = 37681360808. Its totient is φ = 10357079040.

The previous prime is 21122152999. The next prime is 21122153051. The reversal of 21122153044 is 44035122112.

It can be written as a sum of positive squares in 4 ways, for example, as 317552400 + 20804600644 = 17820^2 + 144238^2 .

It is a super-2 number, since 2×21122153044² (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, 46209 + ... + 210664.

Almost surely, 2^21122153044 is an apocalyptic number.

It is an amenable number.

21122153044 is a deficient number, since it is larger than the sum of its proper divisors (16559207764).

21122153044 is a wasteful number, since it uses less digits than its factorization.

21122153044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257275 (or 257273 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 21122153044 its reverse (44035122112), we get a palindrome (65157275156).

The spelling of 21122153044 in words is "twenty-one billion, one hundred twenty-two million, one hundred fifty-three thousand, forty-four".