21400200442 has 4 divisors (see below), whose sum is σ = 32100300666. Its totient is φ = 10700100220.

The previous prime is 21400200433. The next prime is 21400200443. The reversal of 21400200442 is 24400200412.

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

It can be written as a sum of positive squares in only one way, i.e., 20323638721 + 1076561721 = 142561^2 + 32811^2 .

It is not an unprimeable number, because it can be changed into a prime (21400200443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5350050109 + ... + 5350050112.

Almost surely, 2^21400200442 is an apocalyptic number.

21400200442 is a deficient number, since it is larger than the sum of its proper divisors (10700100224).

21400200442 is a wasteful number, since it uses less digits than its factorization.

21400200442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10700100223.

The product of its (nonzero) digits is 512, while the sum is 19.

Adding to 21400200442 its reverse (24400200412), we get a palindrome (45800400854).

The spelling of 21400200442 in words is "twenty-one billion, four hundred million, two hundred thousand, four hundred forty-two".