21015467001 has 12 divisors (see below), whose sum is σ = 30423287700. Its totient is φ = 13979105280.

The previous prime is 21015466991. The next prime is 21015467023. The reversal of 21015467001 is 10076451012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5595788025 + 15419678976 = 74805^2 + 124176^2 .

It is not a de Polignac number, because 21015467001 - 2⁶ = 21015466937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21015467071) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2596240 + ... + 2604321.

It is an arithmetic number, because the mean of its divisors is an integer number (2535273975).

Almost surely, 2^21015467001 is an apocalyptic number.

It is an amenable number.

21015467001 is a deficient number, since it is larger than the sum of its proper divisors (9407820699).

21015467001 is a wasteful number, since it uses less digits than its factorization.

21015467001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5201016 (or 5201013 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The spelling of 21015467001 in words is "twenty-one billion, fifteen million, four hundred sixty-seven thousand, one".