21228464342902 has 4 divisors (see below), whose sum is σ = 31842696514356. Its totient is φ = 10614232171450.

The previous prime is 21228464342879. The next prime is 21228464343043. The reversal of 21228464342902 is 20924346482212.

It is a semiprime because it is the product of two primes.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 5307116085724 + ... + 5307116085727.

It is an arithmetic number, because the mean of its divisors is an integer number (7960674128589).

Almost surely, 2^{21228464342902} is an apocalyptic number.

21228464342902 is a deficient number, since it is larger than the sum of its proper divisors (10614232171454).

21228464342902 is a wasteful number, since it uses less digits than its factorization.

21228464342902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10614232171453.

The product of its (nonzero) digits is 2654208, while the sum is 49.

The spelling of 21228464342902 in words is "twenty-one trillion, two hundred twenty-eight billion, four hundred sixty-four million, three hundred forty-two thousand, nine hundred two".