18211225031 has 8 divisors (see below), whose sum is σ = 18769333440. Its totient is φ = 17660226528.

The previous prime is 18211224943. The next prime is 18211225037. The reversal of 18211225031 is 13052211281.

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

It is a cyclic number.

It is not a de Polignac number, because 18211225031 - 2¹⁴ = 18211208647 is a prime.

It is a super-2 number, since 2×18211225031² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18211225037) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1772276 + ... + 1782521.

It is an arithmetic number, because the mean of its divisors is an integer number (2346166680).

Almost surely, 2^18211225031 is an apocalyptic number.

18211225031 is a deficient number, since it is larger than the sum of its proper divisors (558108409).

18211225031 is a wasteful number, since it uses less digits than its factorization.

18211225031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3554953.

The product of its (nonzero) digits is 960, while the sum is 26.

The spelling of 18211225031 in words is "eighteen billion, two hundred eleven million, two hundred twenty-five thousand, thirty-one".