202354421993 has 2 divisors, whose sum is σ = 202354421994. Its totient is φ = 202354421992.

The previous prime is 202354421921. The next prime is 202354422001. The reversal of 202354421993 is 399124453202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 195927513769 + 6426908224 = 442637^2 + 80168^2 .

It is a cyclic number.

It is not a de Polignac number, because 202354421993 - 2²⁸ = 202085986537 is a prime.

It is a super-2 number, since 2×202354421993² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (202354421903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101177210996 + 101177210997.

It is an arithmetic number, because the mean of its divisors is an integer number (101177210997).

Almost surely, 2^202354421993 is an apocalyptic number.

It is an amenable number.

202354421993 is a deficient number, since it is larger than the sum of its proper divisors (1).

202354421993 is an equidigital number, since it uses as much as digits as its factorization.

202354421993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 466560, while the sum is 44.

The spelling of 202354421993 in words is "two hundred two billion, three hundred fifty-four million, four hundred twenty-one thousand, nine hundred ninety-three".