1540013451221 has 16 divisors (see below), whose sum is σ = 1799636299776. Its totient is φ = 1290363765936.

The previous prime is 1540013451187. The next prime is 1540013451281. The reversal of 1540013451221 is 1221543100451.

It is a happy number.

It is not a de Polignac number, because 1540013451221 - 2¹⁴ = 1540013434837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1540013451281) 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, 2557961 + ... + 3102126.

It is an arithmetic number, because the mean of its divisors is an integer number (112477268736).

Almost surely, 2^{1540013451221} is an apocalyptic number.

It is an amenable number.

1540013451221 is a deficient number, since it is larger than the sum of its proper divisors (259622848555).

1540013451221 is an equidigital number, since it uses as much as digits as its factorization.

1540013451221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5660968.

The product of its (nonzero) digits is 4800, while the sum is 29.

Adding to 1540013451221 its reverse (1221543100451), we get a palindrome (2761556551672).

The spelling of 1540013451221 in words is "one trillion, five hundred forty billion, thirteen million, four hundred fifty-one thousand, two hundred twenty-one".