11372820421 has 2 divisors, whose sum is σ = 11372820422.
Its totient is φ = 11372820420.
The previous prime is 11372820391. The next prime is 11372820457. The reversal of 11372820421 is 12402827311.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 7497135396 + 3875685025 = 86586^2 + 62255^2
It is a cyclic number.
It is not a de Polignac number, because 11372820421 - 221 = 11370723269 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (11372820461) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5686410210 + 5686410211.
It is an arithmetic number, because the mean of its divisors is an integer number (5686410211).
Almost surely, 211372820421 is an apocalyptic number.
It is an amenable number.
11372820421 is a deficient number, since it is larger than the sum of its proper divisors (1).
11372820421 is an equidigital number, since it uses as much as digits as its factorization.
11372820421 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 5376, while the sum is 31.
The spelling of 11372820421 in words is "eleven billion, three hundred seventy-two million, eight hundred twenty thousand, four hundred twenty-one".