21121035371 has 2 divisors, whose sum is σ = 21121035372. Its totient is φ = 21121035370.

The previous prime is 21121035361. The next prime is 21121035431. The reversal of 21121035371 is 17353012112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21121035371 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21121035371.

It is not a weakly prime, because it can be changed into another prime (21121035361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560517685 + 10560517686.

It is an arithmetic number, because the mean of its divisors is an integer number (10560517686).

Almost surely, 2^21121035371 is an apocalyptic number.

21121035371 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121035371 is an equidigital number, since it uses as much as digits as its factorization.

21121035371 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 26.

Adding to 21121035371 its reverse (17353012112), we get a palindrome (38474047483).

The spelling of 21121035371 in words is "twenty-one billion, one hundred twenty-one million, thirty-five thousand, three hundred seventy-one".