21011452555 has 32 divisors (see below), whose sum is σ = 25731883008. Its totient is φ = 16468348800.

The previous prime is 21011452421. The next prime is 21011452603. The reversal of 21011452555 is 55525411012.

It is not a de Polignac number, because 21011452555 - 2¹¹ = 21011450507 is a prime.

It is a super-2 number, since 2×21011452555² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22328385 + ... + 22329325.

It is an arithmetic number, because the mean of its divisors is an integer number (804121344).

Almost surely, 2^21011452555 is an apocalyptic number.

21011452555 is a deficient number, since it is larger than the sum of its proper divisors (4720430453).

21011452555 is a wasteful number, since it uses less digits than its factorization.

21011452555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1467.

The product of its (nonzero) digits is 10000, while the sum is 31.

Adding to 21011452555 its reverse (55525411012), we get a palindrome (76536863567).

The spelling of 21011452555 in words is "twenty-one billion, eleven million, four hundred fifty-two thousand, five hundred fifty-five".