20400214381 has 2 divisors, whose sum is σ = 20400214382. Its totient is φ = 20400214380.

The previous prime is 20400214369. The next prime is 20400214403. The reversal of 20400214381 is 18341200402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14945062500 + 5455151881 = 122250^2 + 73859^2 .

It is a cyclic number.

It is not a de Polignac number, because 20400214381 - 2⁵ = 20400214349 is a prime.

It is a super-2 number, since 2×20400214381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20400218381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200107190 + 10200107191.

It is an arithmetic number, because the mean of its divisors is an integer number (10200107191).

Almost surely, 2^20400214381 is an apocalyptic number.

It is an amenable number.

20400214381 is a deficient number, since it is larger than the sum of its proper divisors (1).

20400214381 is an equidigital number, since it uses as much as digits as its factorization.

20400214381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 20400214381 its reverse (18341200402), we get a palindrome (38741414783).

It can be divided in two parts, 2040021 and 4381, that added together give a palindrome (2044402).

The spelling of 20400214381 in words is "twenty billion, four hundred million, two hundred fourteen thousand, three hundred eighty-one".