20400221242 has 8 divisors (see below), whose sum is σ = 30777212916. Its totient is φ = 10141150272.

The previous prime is 20400221183. The next prime is 20400221249. The reversal of 20400221242 is 24212200402.

It can be written as a sum of positive squares in 2 ways, for example, as 20394981721 + 5239521 = 142811^2 + 2289^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20400221249) 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, 29479743 + ... + 29480434.

Almost surely, 2^20400221242 is an apocalyptic number.

20400221242 is a deficient number, since it is larger than the sum of its proper divisors (10376991674).

20400221242 is a wasteful number, since it uses less digits than its factorization.

20400221242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58960352.

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

Adding to 20400221242 its reverse (24212200402), we get a palindrome (44612421644).

The spelling of 20400221242 in words is "twenty billion, four hundred million, two hundred twenty-one thousand, two hundred forty-two".