21607007949 has 24 divisors (see below), whose sum is σ = 31390744320. Its totient is φ = 14321503392.

The previous prime is 21607007941. The next prime is 21607007957. The reversal of 21607007949 is 94970070612.

It is an interprime number because it is at equal distance from previous prime (21607007941) and next prime (21607007957).

It is not a de Polignac number, because 21607007949 - 2³ = 21607007941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21607007941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1396912 + ... + 1412294.

It is an arithmetic number, because the mean of its divisors is an integer number (1307947680).

Almost surely, 2^21607007949 is an apocalyptic number.

It is an amenable number.

21607007949 is a deficient number, since it is larger than the sum of its proper divisors (9783736371).

21607007949 is a wasteful number, since it uses less digits than its factorization.

21607007949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16281 (or 16278 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 45.

The spelling of 21607007949 in words is "twenty-one billion, six hundred seven million, seven thousand, nine hundred forty-nine".