231621072306 has 16 divisors (see below), whose sum is σ = 498876155904. Its totient is φ = 71268022224.

The previous prime is 231621072281. The next prime is 231621072311. The reversal of 231621072306 is 603270126132.

It is a super-2 number, since 2×231621072306² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1484750386 + ... + 1484750541.

It is an arithmetic number, because the mean of its divisors is an integer number (31179759744).

Almost surely, 2^231621072306 is an apocalyptic number.

231621072306 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

231621072306 is an abundant number, since it is smaller than the sum of its proper divisors (267255083598).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231621072306 is a wasteful number, since it uses less digits than its factorization.

231621072306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2969500945.

The product of its (nonzero) digits is 18144, while the sum is 33.

Adding to 231621072306 its reverse (603270126132), we get a palindrome (834891198438).

The spelling of 231621072306 in words is "two hundred thirty-one billion, six hundred twenty-one million, seventy-two thousand, three hundred six".