21755145401 has 8 divisors (see below), whose sum is σ = 24764750784. Its totient is φ = 18917517520.

The previous prime is 21755145329. The next prime is 21755145403. The reversal of 21755145401 is 10454155712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21755145401 - 2¹⁰ = 21755144377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21755145403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42994106 + ... + 42994611.

It is an arithmetic number, because the mean of its divisors is an integer number (3095593848).

Almost surely, 2^21755145401 is an apocalyptic number.

It is an amenable number.

21755145401 is a deficient number, since it is larger than the sum of its proper divisors (3009605383).

21755145401 is a wasteful number, since it uses less digits than its factorization.

21755145401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85988751.

The product of its (nonzero) digits is 28000, while the sum is 35.

The spelling of 21755145401 in words is "twenty-one billion, seven hundred fifty-five million, one hundred forty-five thousand, four hundred one".