1012402220221 has 4 divisors (see below), whose sum is σ = 1157031108832. Its totient is φ = 867773331612.

The previous prime is 1012402220153. The next prime is 1012402220261. The reversal of 1012402220221 is 1220222042101.

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 1012402220221 - 2²⁹ = 1011865349309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012402220261) 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, 72314444295 + ... + 72314444308.

It is an arithmetic number, because the mean of its divisors is an integer number (289257777208).

Almost surely, 2^{1012402220221} is an apocalyptic number.

It is an amenable number.

1012402220221 is a deficient number, since it is larger than the sum of its proper divisors (144628888611).

1012402220221 is an equidigital number, since it uses as much as digits as its factorization.

1012402220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144628888610.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 1012402220221 its reverse (1220222042101), we get a palindrome (2232624262322).

The spelling of 1012402220221 in words is "one trillion, twelve billion, four hundred two million, two hundred twenty thousand, two hundred twenty-one".