212021121397 has 2 divisors, whose sum is σ = 212021121398. Its totient is φ = 212021121396.

The previous prime is 212021121343. The next prime is 212021121419. The reversal of 212021121397 is 793121120212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 202602612996 + 9418508401 = 450114^2 + 97049^2 .

It is a cyclic number.

It is not a de Polignac number, because 212021121397 - 2⁷ = 212021121269 is a prime.

It is a super-2 number, since 2×212021121397² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212021121097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106010560698 + 106010560699.

It is an arithmetic number, because the mean of its divisors is an integer number (106010560699).

Almost surely, 2^212021121397 is an apocalyptic number.

It is an amenable number.

212021121397 is a deficient number, since it is larger than the sum of its proper divisors (1).

212021121397 is an equidigital number, since it uses as much as digits as its factorization.

212021121397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 31.

The spelling of 212021121397 in words is "two hundred twelve billion, twenty-one million, one hundred twenty-one thousand, three hundred ninety-seven".