1005505501021 has 144 divisors (see below), whose sum is σ = 1345855089600. Its totient is φ = 746513252352.

The previous prime is 1005505501019. The next prime is 1005505501051. The reversal of 1005505501021 is 1201055055001.

It is not a de Polignac number, because 1005505501021 - 2¹ = 1005505501019 is a prime.

It is a super-2 number, since 2×1005505501021² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1005505501001) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 1539824331 + ... + 1539824983.

It is an arithmetic number, because the mean of its divisors is an integer number (9346215900).

Almost surely, 2^{1005505501021} is an apocalyptic number.

It is an amenable number.

1005505501021 is a deficient number, since it is larger than the sum of its proper divisors (340349588579).

1005505501021 is a wasteful number, since it uses less digits than its factorization.

1005505501021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876 (or 852 counting only the distinct ones).

The product of its (nonzero) digits is 1250, while the sum is 25.

The spelling of 1005505501021 in words is "one trillion, five billion, five hundred five million, five hundred one thousand, twenty-one".