21476517164542 has 32 divisors (see below), whose sum is σ = 36358309192320. Its totient is φ = 9424633152480.

The previous prime is 21476517164539. The next prime is 21476517164617. The reversal of 21476517164542 is 24546171567412.

It is a super-2 number, since 2×21476517164542² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6152833 + ... + 8989459.

It is an arithmetic number, because the mean of its divisors is an integer number (1136197162260).

Almost surely, 2^{21476517164542} is an apocalyptic number.

21476517164542 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21476517164542 is a deficient number, since it is larger than the sum of its proper divisors (14881792027778).

21476517164542 is a wasteful number, since it uses less digits than its factorization.

21476517164542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2848536.

The product of its digits is 11289600, while the sum is 55.

The spelling of 21476517164542 in words is "twenty-one trillion, four hundred seventy-six billion, five hundred seventeen million, one hundred sixty-four thousand, five hundred forty-two".