21043211442 has 32 divisors (see below), whose sum is σ = 46428344640. Its totient is φ = 6305080320.

The previous prime is 21043211429. The next prime is 21043211447. The reversal of 21043211442 is 24411234012.

It is not an unprimeable number, because it can be changed into a prime (21043211447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1785343 + ... + 1797090.

It is an arithmetic number, because the mean of its divisors is an integer number (1450885770).

Almost surely, 2^21043211442 is an apocalyptic number.

21043211442 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21043211442 is an abundant number, since it is smaller than the sum of its proper divisors (25385133198).

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

21043211442 is a wasteful number, since it uses less digits than its factorization.

21043211442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3582538.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21043211442 its reverse (24411234012), we get a palindrome (45454445454).

The spelling of 21043211442 in words is "twenty-one billion, forty-three million, two hundred eleven thousand, four hundred forty-two".