2151212340405 has 32 divisors (see below), whose sum is σ = 3535483824000. Its totient is φ = 1116140988672.

The previous prime is 2151212340391. The next prime is 2151212340493. The reversal of 2151212340405 is 5040432121512.

It is not a de Polignac number, because 2151212340405 - 2¹⁵ = 2151212307637 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3548031 + ... + 4109859.

It is an arithmetic number, because the mean of its divisors is an integer number (110483869500).

Almost surely, 2^{2151212340405} is an apocalyptic number.

It is an amenable number.

2151212340405 is a deficient number, since it is larger than the sum of its proper divisors (1384271483595).

2151212340405 is a wasteful number, since it uses less digits than its factorization.

2151212340405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568773.

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 2151212340405 its reverse (5040432121512), we get a palindrome (7191644461917).

The spelling of 2151212340405 in words is "two trillion, one hundred fifty-one billion, two hundred twelve million, three hundred forty thousand, four hundred five".