21237541267 has 2 divisors, whose sum is σ = 21237541268. Its totient is φ = 21237541266.

The previous prime is 21237541249. The next prime is 21237541301. The reversal of 21237541267 is 76214573212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21237541267 is a prime.

It is not a weakly prime, because it can be changed into another prime (21237541217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10618770633 + 10618770634.

It is an arithmetic number, because the mean of its divisors is an integer number (10618770634).

Almost surely, 2^21237541267 is an apocalyptic number.

21237541267 is a deficient number, since it is larger than the sum of its proper divisors (1).

21237541267 is an equidigital number, since it uses as much as digits as its factorization.

21237541267 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141120, while the sum is 40.

The spelling of 21237541267 in words is "twenty-one billion, two hundred thirty-seven million, five hundred forty-one thousand, two hundred sixty-seven".