21140431422 has 32 divisors (see below), whose sum is σ = 46171641600. Its totient is φ = 6399654720.

The previous prime is 21140431381. The next prime is 21140431427. The reversal of 21140431422 is 22413404112.

It is a junction number, because it is equal to n+sod(n) for n = 21140431392 and 21140431401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21140431427) 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, 98047 + ... + 227802.

It is an arithmetic number, because the mean of its divisors is an integer number (1442863800).

Almost surely, 2^21140431422 is an apocalyptic number.

21140431422 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21140431422 is an abundant number, since it is smaller than the sum of its proper divisors (25031210178).

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

21140431422 is a wasteful number, since it uses less digits than its factorization.

21140431422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326848.

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

Adding to 21140431422 its reverse (22413404112), we get a palindrome (43553835534).

The spelling of 21140431422 in words is "twenty-one billion, one hundred forty million, four hundred thirty-one thousand, four hundred twenty-two".