1921506052001 has 4 divisors (see below), whose sum is σ = 1921797240000. Its totient is φ = 1921214864004.

The previous prime is 1921506051967. The next prime is 1921506052003. The reversal of 1921506052001 is 1002506051291.

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 1921506052001 - 2¹⁰ = 1921506050977 is a prime.

It is a super-2 number, since 2×1921506052001² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1921506052003) 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, 145584101 + ... + 145597298.

It is an arithmetic number, because the mean of its divisors is an integer number (480449310000).

Almost surely, 2^{1921506052001} is an apocalyptic number.

It is an amenable number.

1921506052001 is a deficient number, since it is larger than the sum of its proper divisors (291187999).

1921506052001 is an equidigital number, since it uses as much as digits as its factorization.

1921506052001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291187998.

The product of its (nonzero) digits is 5400, while the sum is 32.

The spelling of 1921506052001 in words is "one trillion, nine hundred twenty-one billion, five hundred six million, fifty-two thousand, one".