21091107322031 has 4 divisors (see below), whose sum is σ = 21092306993064. Its totient is φ = 21089907651000.

The previous prime is 21091107322007. The next prime is 21091107322057. The reversal of 21091107322031 is 13022370119012.

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 21091107322031 - 2⁶ = 21091107321967 is a prime.

It is a super-2 number, since 2×21091107322031² (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 (21091107322091) 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, 599809145 + ... + 599844306.

It is an arithmetic number, because the mean of its divisors is an integer number (5273076748266).

Almost surely, 2^{21091107322031} is an apocalyptic number.

21091107322031 is a deficient number, since it is larger than the sum of its proper divisors (1199671033).

21091107322031 is a wasteful number, since it uses less digits than its factorization.

21091107322031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1199671032.

The product of its (nonzero) digits is 4536, while the sum is 32.

The spelling of 21091107322031 in words is "twenty-one trillion, ninety-one billion, one hundred seven million, three hundred twenty-two thousand, thirty-one".