1029126871621 has 4 divisors (see below), whose sum is σ = 1029129318144. Its totient is φ = 1029124425100.

The previous prime is 1029126871613. The next prime is 1029126871657. The reversal of 1029126871621 is 1261786219201.

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 1029126871621 - 2³ = 1029126871613 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 (1029126871921) 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, 413695 + ... + 1493116.

It is an arithmetic number, because the mean of its divisors is an integer number (257282329536).

Almost surely, 2^{1029126871621} is an apocalyptic number.

It is an amenable number.

1029126871621 is a deficient number, since it is larger than the sum of its proper divisors (2446523).

1029126871621 is an equidigital number, since it uses as much as digits as its factorization.

1029126871621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2446522.

The product of its (nonzero) digits is 145152, while the sum is 46.

The spelling of 1029126871621 in words is "one trillion, twenty-nine billion, one hundred twenty-six million, eight hundred seventy-one thousand, six hundred twenty-one".