21155701753 has 16 divisors (see below), whose sum is σ = 23154120000. Its totient is φ = 19252804032.

The previous prime is 21155701717. The next prime is 21155701813. The reversal of 21155701753 is 35710755112.

It is a cyclic number.

It is not a de Polignac number, because 21155701753 - 2³³ = 12565767161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21155701453) 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, 11098 + ... + 205996.

It is an arithmetic number, because the mean of its divisors is an integer number (1447132500).

Almost surely, 2^21155701753 is an apocalyptic number.

It is an amenable number.

21155701753 is a deficient number, since it is larger than the sum of its proper divisors (1998418247).

21155701753 is a wasteful number, since it uses less digits than its factorization.

21155701753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195144.

The product of its (nonzero) digits is 36750, while the sum is 37.

The spelling of 21155701753 in words is "twenty-one billion, one hundred fifty-five million, seven hundred one thousand, seven hundred fifty-three".