1321201101020 has 48 divisors (see below), whose sum is σ = 2802815876448. Its totient is φ = 523094265600.

The previous prime is 1321201100963. The next prime is 1321201101029. The reversal of 1321201101020 is 201011021231.

It is a junction number, because it is equal to n+sod(n) for n = 1321201100986 and 1321201101004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321201101029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6909014 + ... + 7097666.

It is an arithmetic number, because the mean of its divisors is an integer number (58391997426).

Almost surely, 2^{1321201101020} is an apocalyptic number.

1321201101020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321201101020 is an abundant number, since it is smaller than the sum of its proper divisors (1481614775428).

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

1321201101020 is a wasteful number, since it uses less digits than its factorization.

1321201101020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192230 (or 192228 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 1321201101020 its reverse (201011021231), we get a palindrome (1522212122251).

The spelling of 1321201101020 in words is "one trillion, three hundred twenty-one billion, two hundred one million, one hundred one thousand, twenty".