21010444422031 has 4 divisors (see below), whose sum is σ = 21139342854232. Its totient is φ = 20881545989832.

The previous prime is 21010444421977. The next prime is 21010444422059. The reversal of 21010444422031 is 13022444401012.

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

It is a cyclic number.

It is not a de Polignac number, because 21010444422031 - 2¹¹ = 21010444419983 is a prime.

It is a super-2 number, since 2×21010444422031² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010444422091) 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, 64449215856 + ... + 64449216181.

It is an arithmetic number, because the mean of its divisors is an integer number (5284835713558).

Almost surely, 2^{21010444422031} is an apocalyptic number.

21010444422031 is a deficient number, since it is larger than the sum of its proper divisors (128898432201).

21010444422031 is a wasteful number, since it uses less digits than its factorization.

21010444422031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128898432200.

The product of its (nonzero) digits is 6144, while the sum is 28.

Adding to 21010444422031 its reverse (13022444401012), we get a palindrome (34032888823043).

The spelling of 21010444422031 in words is "twenty-one trillion, ten billion, four hundred forty-four million, four hundred twenty-two thousand, thirty-one".