21540927001 has 16 divisors (see below), whose sum is σ = 24947231040. Its totient is φ = 18382049280.

The previous prime is 21540926999. The next prime is 21540927113. The reversal of 21540927001 is 10072904512.

It is a cyclic number.

It is not a de Polignac number, because 21540927001 - 2¹ = 21540926999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21540927901) 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, 81096 + ... + 222841.

It is an arithmetic number, because the mean of its divisors is an integer number (1559201940).

Almost surely, 2^21540927001 is an apocalyptic number.

It is an amenable number.

21540927001 is a deficient number, since it is larger than the sum of its proper divisors (3406304039).

21540927001 is a wasteful number, since it uses less digits than its factorization.

21540927001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304344.

The product of its (nonzero) digits is 5040, while the sum is 31.

The spelling of 21540927001 in words is "twenty-one billion, five hundred forty million, nine hundred twenty-seven thousand, one".