1521421220131 has 4 divisors (see below), whose sum is σ = 1529920780200. Its totient is φ = 1512921660064.

The previous prime is 1521421220107. The next prime is 1521421220167. The reversal of 1521421220131 is 1310221241251.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1521421220131 - 2¹⁹ = 1521420695843 is a prime.

It is a super-2 number, since 2×1521421220131² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1521421220096 and 1521421220105.

It is not an unprimeable number, because it can be changed into a prime (1521421220191) 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, 4249779766 + ... + 4249780123.

It is an arithmetic number, because the mean of its divisors is an integer number (382480195050).

Almost surely, 2^{1521421220131} is an apocalyptic number.

1521421220131 is a deficient number, since it is larger than the sum of its proper divisors (8499560069).

1521421220131 is an equidigital number, since it uses as much as digits as its factorization.

1521421220131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8499560068.

The product of its (nonzero) digits is 960, while the sum is 25.

Adding to 1521421220131 its reverse (1310221241251), we get a palindrome (2831642461382).

The spelling of 1521421220131 in words is "one trillion, five hundred twenty-one billion, four hundred twenty-one million, two hundred twenty thousand, one hundred thirty-one".