1320121231 has 16 divisors (see below), whose sum is σ = 1558817568. Its totient is φ = 1102147200.

The previous prime is 1320121223. The next prime is 1320121237. The reversal of 1320121231 is 1321210231.

It is not a de Polignac number, because 1320121231 - 2³ = 1320121223 is a prime.

It is a super-2 number, since 2×1320121231² = 3485440129073910722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320121237) 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, 4741 + ... + 51601.

It is an arithmetic number, because the mean of its divisors is an integer number (97426098).

Almost surely, 2^1320121231 is an apocalyptic number.

1320121231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1320121231 is a deficient number, since it is larger than the sum of its proper divisors (238696337).

1320121231 is a wasteful number, since it uses less digits than its factorization.

1320121231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47082.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1320121231 is about 36333.4725975924. The cubic root of 1320121231 is about 1096.9948917102.

Adding to 1320121231 its reverse (1321210231), we get a palindrome (2641331462).

The spelling of 1320121231 in words is "one billion, three hundred twenty million, one hundred twenty-one thousand, two hundred thirty-one".