151231510221 has 16 divisors (see below), whose sum is σ = 220076433408. Its totient is φ = 91612407600.

The previous prime is 151231510217. The next prime is 151231510231. The reversal of 151231510221 is 122015132151.

It is not a de Polignac number, because 151231510221 - 2² = 151231510217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 151231510191 and 151231510200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151231510201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1004941 + ... + 1145586.

It is an arithmetic number, because the mean of its divisors is an integer number (13754777088).

Almost surely, 2^151231510221 is an apocalyptic number.

151231510221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

151231510221 is a deficient number, since it is larger than the sum of its proper divisors (68844923187).

151231510221 is a wasteful number, since it uses less digits than its factorization.

151231510221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2152672.

The product of its (nonzero) digits is 600, while the sum is 24.

Adding to 151231510221 its reverse (122015132151), we get a palindrome (273246642372).

The spelling of 151231510221 in words is "one hundred fifty-one billion, two hundred thirty-one million, five hundred ten thousand, two hundred twenty-one".