21520002222555 has 16 divisors (see below), whose sum is σ = 34432120361760. Its totient is φ = 11477295583488.

The previous prime is 21520002222527. The next prime is 21520002222557. The reversal of 21520002222555 is 55522220002512.

It is not a de Polignac number, because 21520002222555 - 2⁷ = 21520002222427 is a prime.

It is a super-2 number, since 2×21520002222555² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21520002222557) 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, 2452041 + ... + 7003749.

It is an arithmetic number, because the mean of its divisors is an integer number (2152007522610).

Almost surely, 2^{21520002222555} is an apocalyptic number.

21520002222555 is a deficient number, since it is larger than the sum of its proper divisors (12912118139205).

21520002222555 is a wasteful number, since it uses less digits than its factorization.

21520002222555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4866910.

The product of its (nonzero) digits is 40000, while the sum is 33.

The spelling of 21520002222555 in words is "twenty-one trillion, five hundred twenty billion, two million, two hundred twenty-two thousand, five hundred fifty-five".