21877147249 has 8 divisors (see below), whose sum is σ = 22083540552. Its totient is φ = 21670978560.

The previous prime is 21877147241. The next prime is 21877147307. The reversal of 21877147249 is 94274177812.

It can be written as a sum of positive squares in 4 ways, for example, as 3600000000 + 18277147249 = 60000^2 + 135193^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21877147249 - 2³ = 21877147241 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21877147196 and 21877147205.

It is not an unprimeable number, because it can be changed into a prime (21877147241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142869 + ... + 253309.

It is an arithmetic number, because the mean of its divisors is an integer number (2760442569).

Almost surely, 2^21877147249 is an apocalyptic number.

It is an amenable number.

21877147249 is a deficient number, since it is larger than the sum of its proper divisors (206393303).

21877147249 is a wasteful number, since it uses less digits than its factorization.

21877147249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112307.

The product of its digits is 1580544, while the sum is 52.

The spelling of 21877147249 in words is "twenty-one billion, eight hundred seventy-seven million, one hundred forty-seven thousand, two hundred forty-nine".