21421200142 has 4 divisors (see below), whose sum is σ = 32131800216. Its totient is φ = 10710600070.

The previous prime is 21421200103. The next prime is 21421200179. The reversal of 21421200142 is 24100212412.

It is a semiprime because it is the product of two primes.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 5355300034 + ... + 5355300037.

It is an arithmetic number, because the mean of its divisors is an integer number (8032950054).

Almost surely, 2^21421200142 is an apocalyptic number.

21421200142 is a deficient number, since it is larger than the sum of its proper divisors (10710600074).

21421200142 is a wasteful number, since it uses less digits than its factorization.

21421200142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10710600073.

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

Adding to 21421200142 its reverse (24100212412), we get a palindrome (45521412554).

The spelling of 21421200142 in words is "twenty-one billion, four hundred twenty-one million, two hundred thousand, one hundred forty-two".