21054023453212 has 24 divisors (see below), whose sum is σ = 39012081104304. Its totient is φ = 9907721363712.

The previous prime is 21054023453149. The next prime is 21054023453237. The reversal of 21054023453212 is 21235432045012.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13367298 + ... + 14859094.

It is an arithmetic number, because the mean of its divisors is an integer number (1625503379346).

Almost surely, 2^{21054023453212} is an apocalyptic number.

It is an amenable number.

21054023453212 is a deficient number, since it is larger than the sum of its proper divisors (17958057651092).

21054023453212 is a wasteful number, since it uses less digits than its factorization.

21054023453212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1699365 (or 1699363 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 34.

Adding to 21054023453212 its reverse (21235432045012), we get a palindrome (42289455498224).

The spelling of 21054023453212 in words is "twenty-one trillion, fifty-four billion, twenty-three million, four hundred fifty-three thousand, two hundred twelve".