21212864351 has 12 divisors (see below), whose sum is σ = 24718988448. Its totient is φ = 18150918912.

The previous prime is 21212864297. The next prime is 21212864353. The reversal of 21212864351 is 15346821212.

It is not a de Polignac number, because 21212864351 - 2¹⁰ = 21212863327 is a prime.

It is a super-2 number, since 2×21212864351² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212864353) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 346871 + ... + 403416.

It is an arithmetic number, because the mean of its divisors is an integer number (2059915704).

Almost surely, 2^21212864351 is an apocalyptic number.

21212864351 is a deficient number, since it is larger than the sum of its proper divisors (3506124097).

21212864351 is an equidigital number, since it uses as much as digits as its factorization.

21212864351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750878 (or 750871 counting only the distinct ones).

The product of its digits is 23040, while the sum is 35.

The spelling of 21212864351 in words is "twenty-one billion, two hundred twelve million, eight hundred sixty-four thousand, three hundred fifty-one".