12221542541 has 8 divisors (see below), whose sum is σ = 13165411224. Its totient is φ = 11278209600.

The previous prime is 12221542519. The next prime is 12221542589. The reversal of 12221542541 is 14524512221.

It can be written as a sum of positive squares in 4 ways, for example, as 417589225 + 11803953316 = 20435^2 + 108646^2 .

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 12221542541 - 2⁶ = 12221542477 is a prime.

It is a super-2 number, since 2×12221542541² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221542741) 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, 85910 + ... + 178391.

It is an arithmetic number, because the mean of its divisors is an integer number (1645676403).

Almost surely, 2^12221542541 is an apocalyptic number.

It is an amenable number.

12221542541 is a deficient number, since it is larger than the sum of its proper divisors (943868683).

12221542541 is a wasteful number, since it uses less digits than its factorization.

12221542541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267871.

The product of its digits is 6400, while the sum is 29.

The spelling of 12221542541 in words is "twelve billion, two hundred twenty-one million, five hundred forty-two thousand, five hundred forty-one".