21161514994490 has 32 divisors (see below), whose sum is σ = 41058313639056. Its totient is φ = 7806333749760.

The previous prime is 21161514994453. The next prime is 21161514994519. The reversal of 21161514994490 is 9449941516112.

It can be written as a sum of positive squares in 8 ways, for example, as 14834383480849 + 6327131513641 = 3851543^2 + 2515379^2 .

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, 74323091 + ... + 74607270.

Almost surely, 2^{21161514994490} is an apocalyptic number.

21161514994490 is a deficient number, since it is larger than the sum of its proper divisors (19896798644566).

21161514994490 is a wasteful number, since it uses less digits than its factorization.

21161514994490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148931474.

The product of its (nonzero) digits is 2799360, while the sum is 56.

The spelling of 21161514994490 in words is "twenty-one trillion, one hundred sixty-one billion, five hundred fourteen million, nine hundred ninety-four thousand, four hundred ninety".