21011512494 has 32 divisors (see below), whose sum is σ = 48036105216. Its totient is φ = 6002065440.

The previous prime is 21011512481. The next prime is 21011512567. The reversal of 21011512494 is 49421511012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 168604 + ... + 265424.

It is an arithmetic number, because the mean of its divisors is an integer number (1501128288).

Almost surely, 2^21011512494 is an apocalyptic number.

21011512494 is an abundant number, since it is smaller than the sum of its proper divisors (27024592722).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21011512494 is a wasteful number, since it uses less digits than its factorization.

21011512494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102000.

The product of its (nonzero) digits is 2880, while the sum is 30.

The spelling of 21011512494 in words is "twenty-one billion, eleven million, five hundred twelve thousand, four hundred ninety-four".