21546131645001 has 16 divisors (see below), whose sum is σ = 29342667393344. Its totient is φ = 14059572905664.

The previous prime is 21546131644963. The next prime is 21546131645011. The reversal of 21546131645001 is 10054613164512.

It is not a de Polignac number, because 21546131645001 - 2²⁶ = 21546064536137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21546131645011) 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, 341352790 + ... + 341415903.

It is an arithmetic number, because the mean of its divisors is an integer number (1833916712084).

Almost surely, 2^{21546131645001} is an apocalyptic number.

It is an amenable number.

21546131645001 is a deficient number, since it is larger than the sum of its proper divisors (7796535748343).

21546131645001 is a wasteful number, since it uses less digits than its factorization.

21546131645001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682768920.

The product of its (nonzero) digits is 86400, while the sum is 39.

The spelling of 21546131645001 in words is "twenty-one trillion, five hundred forty-six billion, one hundred thirty-one million, six hundred forty-five thousand, one".