1321010021101 has 4 divisors (see below), whose sum is σ = 1321121014272. Its totient is φ = 1320899027932.

The previous prime is 1321010020931. The next prime is 1321010021113. The reversal of 1321010021101 is 1011200101231.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1321010021101 - 2²³ = 1321001632493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321010021131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55478731 + ... + 55502536.

It is an arithmetic number, because the mean of its divisors is an integer number (330280253568).

Almost surely, 2^{1321010021101} is an apocalyptic number.

It is an amenable number.

1321010021101 is a deficient number, since it is larger than the sum of its proper divisors (110993171).

1321010021101 is a wasteful number, since it uses less digits than its factorization.

1321010021101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110993170.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 1321010021101 its reverse (1011200101231), we get a palindrome (2332210122332).

The spelling of 1321010021101 in words is "one trillion, three hundred twenty-one billion, ten million, twenty-one thousand, one hundred one".