1200040740021 has 4 divisors (see below), whose sum is σ = 1600054320032. Its totient is φ = 800027160012.

The previous prime is 1200040739987. The next prime is 1200040740023. The reversal of 1200040740021 is 1200470400021.

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 not a de Polignac number, because 1200040740021 - 2¹³ = 1200040731829 is a prime.

It is a super-2 number, since 2×1200040740021² (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 1200040740021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200040740023) 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, 200006790001 + ... + 200006790006.

It is an arithmetic number, because the mean of its divisors is an integer number (400013580008).

Almost surely, 2^{1200040740021} is an apocalyptic number.

It is an amenable number.

1200040740021 is a deficient number, since it is larger than the sum of its proper divisors (400013580011).

1200040740021 is an equidigital number, since it uses as much as digits as its factorization.

1200040740021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400013580010.

The product of its (nonzero) digits is 448, while the sum is 21.

The spelling of 1200040740021 in words is "one trillion, two hundred billion, forty million, seven hundred forty thousand, twenty-one".