21204560554154 has 16 divisors (see below), whose sum is σ = 33194812243392. Its totient is φ = 10139763842208.

The previous prime is 21204560554117. The next prime is 21204560554231. The reversal of 21204560554154 is 45145506540212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34870904 + ... + 35473779.

It is an arithmetic number, because the mean of its divisors is an integer number (2074675765212).

Almost surely, 2^{21204560554154} is an apocalyptic number.

21204560554154 is a deficient number, since it is larger than the sum of its proper divisors (11990251689238).

21204560554154 is a wasteful number, since it uses less digits than its factorization.

21204560554154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70351261.

The product of its (nonzero) digits is 960000, while the sum is 44.

The spelling of 21204560554154 in words is "twenty-one trillion, two hundred four billion, five hundred sixty million, five hundred fifty-four thousand, one hundred fifty-four".