20121021042 has 16 divisors (see below), whose sum is σ = 40319288352. Its totient is φ = 6694132640.

The previous prime is 20121021031. The next prime is 20121021059. The reversal of 20121021042 is 24012012102.

It is a super-3 number, since 3×20121021042³ (a number of 32 digits) contains 333 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, 3215208 + ... + 3221459.

It is an arithmetic number, because the mean of its divisors is an integer number (2519955522).

Almost surely, 2^20121021042 is an apocalyptic number.

20121021042 is an abundant number, since it is smaller than the sum of its proper divisors (20198267310).

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

20121021042 is a wasteful number, since it uses less digits than its factorization.

20121021042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6437193.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 20121021042 its reverse (24012012102), we get a palindrome (44133033144).

The spelling of 20121021042 in words is "twenty billion, one hundred twenty-one million, twenty-one thousand, forty-two".