21226660242 has 16 divisors (see below), whose sum is σ = 42630952320. Its totient is φ = 7045948112.

The previous prime is 21226660237. The next prime is 21226660271. The reversal of 21226660242 is 24206662212.

It is a super-2 number, since 2×21226660242² (a number of 21 digits) contains 22 as substring.

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, 7399773 + ... + 7402640.

It is an arithmetic number, because the mean of its divisors is an integer number (2664434520).

Almost surely, 2^21226660242 is an apocalyptic number.

21226660242 is an abundant number, since it is smaller than the sum of its proper divisors (21404292078).

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

21226660242 is a wasteful number, since it uses less digits than its factorization.

21226660242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14802657.

The product of its (nonzero) digits is 27648, while the sum is 33.

The spelling of 21226660242 in words is "twenty-one billion, two hundred twenty-six million, six hundred sixty thousand, two hundred forty-two".