21737214849 has 64 divisors (see below), whose sum is σ = 36563484672. Its totient is φ = 11200896000.

The previous prime is 21737214847. The next prime is 21737214853. The reversal of 21737214849 is 94841273712.

It is not a de Polignac number, because 21737214849 - 2¹ = 21737214847 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21737214798 and 21737214807.

It is not an unprimeable number, because it can be changed into a prime (21737214847) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1108044 + ... + 1127490.

It is an arithmetic number, because the mean of its divisors is an integer number (571304448).

Almost surely, 2^21737214849 is an apocalyptic number.

It is an amenable number.

21737214849 is a deficient number, since it is larger than the sum of its proper divisors (14826269823).

21737214849 is a wasteful number, since it uses less digits than its factorization.

21737214849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19606.

The product of its digits is 677376, while the sum is 48.

It can be divided in two parts, 217372 and 14849, that added together give a triangular number (232221 = T₆₈₁).

The spelling of 21737214849 in words is "twenty-one billion, seven hundred thirty-seven million, two hundred fourteen thousand, eight hundred forty-nine".