21170477354 has 32 divisors (see below), whose sum is σ = 34693317120. Its totient is φ = 9630047232.

The previous prime is 21170477333. The next prime is 21170477359. The reversal of 21170477354 is 45377407112.

It is a happy number.

It is a super-2 number, since 2×21170477354² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21170477359) 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, 1176227 + ... + 1194089.

It is an arithmetic number, because the mean of its divisors is an integer number (1084166160).

Almost surely, 2^21170477354 is an apocalyptic number.

21170477354 is a deficient number, since it is larger than the sum of its proper divisors (13522839766).

21170477354 is a wasteful number, since it uses less digits than its factorization.

21170477354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18534.

The product of its (nonzero) digits is 164640, while the sum is 41.

The spelling of 21170477354 in words is "twenty-one billion, one hundred seventy million, four hundred seventy-seven thousand, three hundred fifty-four".