2120405422501 has 4 divisors (see below), whose sum is σ = 2121057657504. Its totient is φ = 2119753187500.

The previous prime is 2120405422451. The next prime is 2120405422511. The reversal of 2120405422501 is 1052245040212.

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 2120405422501 - 2²⁷ = 2120271204773 is a prime.

It is a super-2 number, since 2×2120405422501² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2120405422501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120405422511) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 326112625 + ... + 326119126.

It is an arithmetic number, because the mean of its divisors is an integer number (530264414376).

Almost surely, 2^{2120405422501} is an apocalyptic number.

It is an amenable number.

2120405422501 is a deficient number, since it is larger than the sum of its proper divisors (652235003).

2120405422501 is an equidigital number, since it uses as much as digits as its factorization.

2120405422501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652235002.

The product of its (nonzero) digits is 6400, while the sum is 28.

The spelling of 2120405422501 in words is "two trillion, one hundred twenty billion, four hundred five million, four hundred twenty-two thousand, five hundred one".