21601500576145 has 64 divisors (see below), whose sum is σ = 31917438812160. Its totient is φ = 13703027385600.

The previous prime is 21601500576137. The next prime is 21601500576163. The reversal of 21601500576145 is 54167500510612.

It is a happy number.

It is not a de Polignac number, because 21601500576145 - 2³ = 21601500576137 is a prime.

It is a super-2 number, since 2×21601500576145² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 114886560 + ... + 115074430.

It is an arithmetic number, because the mean of its divisors is an integer number (498709981440).

Almost surely, 2^{21601500576145} is an apocalyptic number.

It is an amenable number.

21601500576145 is a deficient number, since it is larger than the sum of its proper divisors (10315938236015).

21601500576145 is a wasteful number, since it uses less digits than its factorization.

21601500576145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191966.

The product of its (nonzero) digits is 252000, while the sum is 43.

The spelling of 21601500576145 in words is "twenty-one trillion, six hundred one billion, five hundred million, five hundred seventy-six thousand, one hundred forty-five".