21124561149 has 24 divisors (see below), whose sum is σ = 30791584512. Its totient is φ = 13954954560.

The previous prime is 21124561127. The next prime is 21124561169. The reversal of 21124561149 is 94116542112.

21124561149 is a `hidden beast` number, since 2 + 11 + 24 + 5 + 611 + 4 + 9 = 666.

It is not a de Polignac number, because 21124561149 - 2¹² = 21124557053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21124561169) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 678964 + ... + 709394.

It is an arithmetic number, because the mean of its divisors is an integer number (1282982688).

Almost surely, 2^21124561149 is an apocalyptic number.

It is an amenable number.

21124561149 is a deficient number, since it is larger than the sum of its proper divisors (9667023363).

21124561149 is a wasteful number, since it uses less digits than its factorization.

21124561149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31137 (or 31134 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The spelling of 21124561149 in words is "twenty-one billion, one hundred twenty-four million, five hundred sixty-one thousand, one hundred forty-nine".