1321951437650 has 24 divisors (see below), whose sum is σ = 2459683998720. Its totient is φ = 528596849360.

The previous prime is 1321951437601. The next prime is 1321951437661. The reversal of 1321951437650 is 567341591231.

It is a junction number, because it is equal to n+sod(n) for n = 1321951437595 and 1321951437604.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 4447754 + ... + 4735653.

It is an arithmetic number, because the mean of its divisors is an integer number (102486833280).

Almost surely, 2^{1321951437650} is an apocalyptic number.

1321951437650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1321951437650 is a deficient number, since it is larger than the sum of its proper divisors (1137732561070).

1321951437650 is a wasteful number, since it uses less digits than its factorization.

1321951437650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9186298 (or 9186293 counting only the distinct ones).

The product of its (nonzero) digits is 680400, while the sum is 47.

The spelling of 1321951437650 in words is "one trillion, three hundred twenty-one billion, nine hundred fifty-one million, four hundred thirty-seven thousand, six hundred fifty".