2171427503506 has 16 divisors (see below), whose sum is σ = 3450505582080. Its totient is φ = 1021324449600.

The previous prime is 2171427503471. The next prime is 2171427503537. The reversal of 2171427503506 is 6053057241712.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16301046 + ... + 16433713.

It is an arithmetic number, because the mean of its divisors is an integer number (215656598880).

Almost surely, 2^{2171427503506} is an apocalyptic number.

2171427503506 is a deficient number, since it is larger than the sum of its proper divisors (1279078078574).

2171427503506 is a wasteful number, since it uses less digits than its factorization.

2171427503506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32736729.

The product of its (nonzero) digits is 352800, while the sum is 43.

The spelling of 2171427503506 in words is "two trillion, one hundred seventy-one billion, four hundred twenty-seven million, five hundred three thousand, five hundred six".