21022140331406 has 4 divisors (see below), whose sum is σ = 31533210497112. Its totient is φ = 10511070165702.

The previous prime is 21022140331399. The next prime is 21022140331417. The reversal of 21022140331406 is 60413304122012.

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

It is a super-2 number, since 2×21022140331406² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5255535082850 + ... + 5255535082853.

It is an arithmetic number, because the mean of its divisors is an integer number (7883302624278).

Almost surely, 2^{21022140331406} is an apocalyptic number.

21022140331406 is a deficient number, since it is larger than the sum of its proper divisors (10511070165706).

21022140331406 is a wasteful number, since it uses less digits than its factorization.

21022140331406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10511070165705.

The product of its (nonzero) digits is 6912, while the sum is 29.

Adding to 21022140331406 its reverse (60413304122012), we get a palindrome (81435444453418).

The spelling of 21022140331406 in words is "twenty-one trillion, twenty-two billion, one hundred forty million, three hundred thirty-one thousand, four hundred six".