21213055654 has 32 divisors (see below), whose sum is σ = 36750825216. Its totient is φ = 8995039200.

The previous prime is 21213055631. The next prime is 21213055663. The reversal of 21213055654 is 45655031212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2431969 + ... + 2440675.

It is an arithmetic number, because the mean of its divisors is an integer number (1148463288).

Almost surely, 2^21213055654 is an apocalyptic number.

21213055654 is a deficient number, since it is larger than the sum of its proper divisors (15537769562).

21213055654 is a wasteful number, since it uses less digits than its factorization.

21213055654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10540.

The product of its (nonzero) digits is 36000, while the sum is 34.

Adding to 21213055654 its reverse (45655031212), we get a palindrome (66868086866).

The spelling of 21213055654 in words is "twenty-one billion, two hundred thirteen million, fifty-five thousand, six hundred fifty-four".