1321627018921 has 16 divisors (see below), whose sum is σ = 1450249371648. Its totient is φ = 1194437523600.

The previous prime is 1321627018879. The next prime is 1321627018927. The reversal of 1321627018921 is 1298107261231.

It is a cyclic number.

It is not a de Polignac number, because 1321627018921 - 2¹⁵ = 1321626986153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1321627018927) 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, 782476 + ... + 1804306.

It is an arithmetic number, because the mean of its divisors is an integer number (90640585728).

Almost surely, 2^{1321627018921} is an apocalyptic number.

1321627018921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1321627018921 is a deficient number, since it is larger than the sum of its proper divisors (128622352727).

1321627018921 is a wasteful number, since it uses less digits than its factorization.

1321627018921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1022532.

The product of its (nonzero) digits is 72576, while the sum is 43.

The spelling of 1321627018921 in words is "one trillion, three hundred twenty-one billion, six hundred twenty-seven million, eighteen thousand, nine hundred twenty-one".