21349054051520 has 56 divisors (see below), whose sum is σ = 54748006890864. Its totient is φ = 7882727648256.

The previous prime is 21349054051517. The next prime is 21349054051583. The reversal of 21349054051520 is 2515045094312.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2565987914 + ... + 2565996233.

It is an arithmetic number, because the mean of its divisors is an integer number (977642980194).

Almost surely, 2^{21349054051520} is an apocalyptic number.

21349054051520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21349054051520 is an abundant number, since it is smaller than the sum of its proper divisors (33398952839344).

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

21349054051520 is a wasteful number, since it uses less digits than its factorization.

21349054051520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5131984177 (or 5131984167 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 41.

The spelling of 21349054051520 in words is "twenty-one trillion, three hundred forty-nine billion, fifty-four million, fifty-one thousand, five hundred twenty".