21264038246555 has 16 divisors (see below), whose sum is σ = 27481779141600. Its totient is φ = 15701474999808.

The previous prime is 21264038246533. The next prime is 21264038246557. The reversal of 21264038246555 is 55564283046212.

It is not a de Polignac number, because 21264038246555 - 2¹⁸ = 21264037984411 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21264038246497 and 21264038246506.

It is not an unprimeable number, because it can be changed into a prime (21264038246557) 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, 11635742 + ... + 13338611.

It is an arithmetic number, because the mean of its divisors is an integer number (1717611196350).

Almost surely, 2^{21264038246555} is an apocalyptic number.

21264038246555 is a deficient number, since it is larger than the sum of its proper divisors (6217740895045).

21264038246555 is a wasteful number, since it uses less digits than its factorization.

21264038246555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24987470.

The product of its (nonzero) digits is 13824000, while the sum is 53.

The spelling of 21264038246555 in words is "twenty-one trillion, two hundred sixty-four billion, thirty-eight million, two hundred forty-six thousand, five hundred fifty-five".