21121114731 has 8 divisors (see below), whose sum is σ = 28187162064. Its totient is φ = 14067905280.

The previous prime is 21121114727. The next prime is 21121114741. The reversal of 21121114731 is 13741112112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21121114731 - 2² = 21121114727 is a prime.

It is a super-2 number, since 2×21121114731² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121114741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3205630 + ... + 3212211.

It is an arithmetic number, because the mean of its divisors is an integer number (3523395258).

Almost surely, 2^21121114731 is an apocalyptic number.

21121114731 is a deficient number, since it is larger than the sum of its proper divisors (7066047333).

21121114731 is a wasteful number, since it uses less digits than its factorization.

21121114731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6418941.

The product of its digits is 336, while the sum is 24.

Adding to 21121114731 its reverse (13741112112), we get a palindrome (34862226843).

The spelling of 21121114731 in words is "twenty-one billion, one hundred twenty-one million, one hundred fourteen thousand, seven hundred thirty-one".