21503222312555 has 4 divisors (see below), whose sum is σ = 25803866775072. Its totient is φ = 17202577850040.

The previous prime is 21503222312447. The next prime is 21503222312581. The reversal of 21503222312555 is 55521322230512.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21503222312555 - 2⁴² = 17105175801451 is a prime.

It is a super-2 number, since 2×21503222312555² (a number of 27 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 3 ways as a sum of consecutive naturals, for example, 2150322231251 + ... + 2150322231260.

It is an arithmetic number, because the mean of its divisors is an integer number (6450966693768).

Almost surely, 2^{21503222312555} is an apocalyptic number.

21503222312555 is a deficient number, since it is larger than the sum of its proper divisors (4300644462517).

21503222312555 is an equidigital number, since it uses as much as digits as its factorization.

21503222312555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4300644462516.

The product of its (nonzero) digits is 180000, while the sum is 38.

The spelling of 21503222312555 in words is "twenty-one trillion, five hundred three billion, two hundred twenty-two million, three hundred twelve thousand, five hundred fifty-five".