212401621257 has 32 divisors (see below), whose sum is σ = 331292823552. Its totient is φ = 118521571584.

The previous prime is 212401621213. The next prime is 212401621259. The reversal of 212401621257 is 752126104212.

It is not a de Polignac number, because 212401621257 - 2¹⁴ = 212401604873 is a prime.

It is a super-2 number, since 2×212401621257² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (212401621259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 194353 + ... + 680129.

It is an arithmetic number, because the mean of its divisors is an integer number (10352900736).

Almost surely, 2^212401621257 is an apocalyptic number.

It is an amenable number.

212401621257 is a deficient number, since it is larger than the sum of its proper divisors (118891202295).

212401621257 is a wasteful number, since it uses less digits than its factorization.

212401621257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486277.

The product of its (nonzero) digits is 13440, while the sum is 33.

Adding to 212401621257 its reverse (752126104212), we get a palindrome (964527725469).

The spelling of 212401621257 in words is "two hundred twelve billion, four hundred one million, six hundred twenty-one thousand, two hundred fifty-seven".