21020211042 has 8 divisors (see below), whose sum is σ = 42040422096. Its totient is φ = 7006737012.

The previous prime is 21020211041. The next prime is 21020211077. The reversal of 21020211042 is 24011202012.

It is a sphenic number, since it is the product of 3 distinct primes.

21020211042 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21020211041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1751684248 + ... + 1751684259.

It is an arithmetic number, because the mean of its divisors is an integer number (5255052762).

Almost surely, 2^21020211042 is an apocalyptic number.

21020211042 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21020211042 is a wasteful number, since it uses less digits than its factorization.

21020211042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3503368512.

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

Adding to 21020211042 its reverse (24011202012), we get a palindrome (45031413054).

The spelling of 21020211042 in words is "twenty-one billion, twenty million, two hundred eleven thousand, forty-two".