21401033057 has 2 divisors, whose sum is σ = 21401033058. Its totient is φ = 21401033056.

The previous prime is 21401033041. The next prime is 21401033153. The reversal of 21401033057 is 75033010412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19966820416 + 1434212641 = 141304^2 + 37871^2 .

It is a cyclic number.

It is not a de Polignac number, because 21401033057 - 2⁴ = 21401033041 is a prime.

It is not a weakly prime, because it can be changed into another prime (21401035057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10700516528 + 10700516529.

It is an arithmetic number, because the mean of its divisors is an integer number (10700516529).

Almost surely, 2^21401033057 is an apocalyptic number.

It is an amenable number.

21401033057 is a deficient number, since it is larger than the sum of its proper divisors (1).

21401033057 is an equidigital number, since it uses as much as digits as its factorization.

21401033057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 26.

Adding to 21401033057 its reverse (75033010412), we get a palindrome (96434043469).

The spelling of 21401033057 in words is "twenty-one billion, four hundred one million, thirty-three thousand, fifty-seven".