21361656555436 has 12 divisors (see below), whose sum is σ = 39350419970680. Its totient is φ = 10118679420960.

The previous prime is 21361656555401. The next prime is 21361656555467. The reversal of 21361656555436 is 63455565616312.

It is a super-3 number, since 3×21361656555436³ (a number of 41 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (58) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140537214105 + ... + 140537214256.

Almost surely, 2^{21361656555436} is an apocalyptic number.

It is an amenable number.

21361656555436 is a deficient number, since it is larger than the sum of its proper divisors (17988763415244).

21361656555436 is a wasteful number, since it uses less digits than its factorization.

21361656555436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281074428384 (or 281074428382 counting only the distinct ones).

The product of its digits is 58320000, while the sum is 58.

The spelling of 21361656555436 in words is "twenty-one trillion, three hundred sixty-one billion, six hundred fifty-six million, five hundred fifty-five thousand, four hundred thirty-six".