21121202242 has 16 divisors (see below), whose sum is σ = 36290263680. Its totient is φ = 9031321728.

The previous prime is 21121202177. The next prime is 21121202279. The reversal of 21121202242 is 24220212112.

It is a super-2 number, since 2×21121202242² (a number of 21 digits) contains 22 as substring.

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, 1712143 + ... + 1724434.

It is an arithmetic number, because the mean of its divisors is an integer number (2268141480).

Almost surely, 2^21121202242 is an apocalyptic number.

21121202242 is a deficient number, since it is larger than the sum of its proper divisors (15169061438).

21121202242 is a wasteful number, since it uses less digits than its factorization.

21121202242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3437025.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21121202242 its reverse (24220212112), we get a palindrome (45341414354).

The spelling of 21121202242 in words is "twenty-one billion, one hundred twenty-one million, two hundred two thousand, two hundred forty-two".