21422111477 has 16 divisors (see below), whose sum is σ = 23623309248. Its totient is φ = 19300619520.

The previous prime is 21422111441. The next prime is 21422111489. The reversal of 21422111477 is 77411122412.

It is not a de Polignac number, because 21422111477 - 2²² = 21417917173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21422111177) 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, 816077 + ... + 841917.

It is an arithmetic number, because the mean of its divisors is an integer number (1476456828).

Almost surely, 2^21422111477 is an apocalyptic number.

It is an amenable number.

21422111477 is a deficient number, since it is larger than the sum of its proper divisors (2201197771).

21422111477 is a wasteful number, since it uses less digits than its factorization.

21422111477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27380.

The product of its digits is 6272, while the sum is 32.

Adding to 21422111477 its reverse (77411122412), we get a palindrome (98833233889).

The spelling of 21422111477 in words is "twenty-one billion, four hundred twenty-two million, one hundred eleven thousand, four hundred seventy-seven".