21542082202154 has 16 divisors (see below), whose sum is σ = 32494925960640. Its totient is φ = 10710610204800.

The previous prime is 21542082202133. The next prime is 21542082202171. The reversal of 21542082202154 is 45120228024512.

It is a super-2 number, since 2×21542082202154² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42243572 + ... + 42750479.

It is an arithmetic number, because the mean of its divisors is an integer number (2030932872540).

Almost surely, 2^{21542082202154} is an apocalyptic number.

21542082202154 is a deficient number, since it is larger than the sum of its proper divisors (10952843758486).

21542082202154 is a wasteful number, since it uses less digits than its factorization.

21542082202154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84994765.

The product of its (nonzero) digits is 102400, while the sum is 38.

The spelling of 21542082202154 in words is "twenty-one trillion, five hundred forty-two billion, eighty-two million, two hundred two thousand, one hundred fifty-four".