21504061701 has 12 divisors (see below), whose sum is σ = 32132506380. Its totient is φ = 13841694720.

The previous prime is 21504061697. The next prime is 21504061729. The reversal of 21504061701 is 10716040512.

It is a happy number.

21504061701 is a `hidden beast` number, since 2 + 1 + 5 + 0 + 40 + 617 + 0 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 11608985025 + 9895076676 = 107745^2 + 99474^2 .

It is not a de Polignac number, because 21504061701 - 2² = 21504061697 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21504061771) 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, 41195260 + ... + 41195781.

It is an arithmetic number, because the mean of its divisors is an integer number (2677708865).

Almost surely, 2^21504061701 is an apocalyptic number.

It is an amenable number.

21504061701 is a deficient number, since it is larger than the sum of its proper divisors (10628444679).

21504061701 is a wasteful number, since it uses less digits than its factorization.

21504061701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82391076 (or 82391073 counting only the distinct ones).

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

The spelling of 21504061701 in words is "twenty-one billion, five hundred four million, sixty-one thousand, seven hundred one".