21477366553436 has 48 divisors (see below), whose sum is σ = 38414626983936. Its totient is φ = 10504248822144.

The previous prime is 21477366553429. The next prime is 21477366553439. The reversal of 21477366553436 is 63435566377412.

It is a happy number.

It is a super-2 number, since 2×21477366553436² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21477366553439) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100279415 + ... + 100493361.

It is an arithmetic number, because the mean of its divisors is an integer number (800304728832).

Almost surely, 2^{21477366553436} is an apocalyptic number.

It is an amenable number.

21477366553436 is a deficient number, since it is larger than the sum of its proper divisors (16937260430500).

21477366553436 is a wasteful number, since it uses less digits than its factorization.

21477366553436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216858 (or 216856 counting only the distinct ones).

The product of its digits is 228614400, while the sum is 62.

The spelling of 21477366553436 in words is "twenty-one trillion, four hundred seventy-seven billion, three hundred sixty-six million, five hundred fifty-three thousand, four hundred thirty-six".