21237540763 has 2 divisors, whose sum is σ = 21237540764. Its totient is φ = 21237540762.

The previous prime is 21237540761. The next prime is 21237540773. The reversal of 21237540763 is 36704573212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21237540763 - 2¹ = 21237540761 is a prime.

Together with 21237540761, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21237540761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10618770381 + 10618770382.

It is an arithmetic number, because the mean of its divisors is an integer number (10618770382).

Almost surely, 2^21237540763 is an apocalyptic number.

21237540763 is a deficient number, since it is larger than the sum of its proper divisors (1).

21237540763 is an equidigital number, since it uses as much as digits as its factorization.

21237540763 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 211680, while the sum is 40.

The spelling of 21237540763 in words is "twenty-one billion, two hundred thirty-seven million, five hundred forty thousand, seven hundred sixty-three".