21919408917434 has 24 divisors (see below), whose sum is σ = 39480910339968. Its totient is φ = 9090999088920.

The previous prime is 21919408917383. The next prime is 21919408917449. The reversal of 21919408917434 is 43471980491912.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3607536284 + ... + 3607542359.

It is an arithmetic number, because the mean of its divisors is an integer number (1645037930832).

Almost surely, 2^{21919408917434} is an apocalyptic number.

21919408917434 is a deficient number, since it is larger than the sum of its proper divisors (17561501422534).

21919408917434 is a wasteful number, since it uses less digits than its factorization.

21919408917434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7215078690 (or 7215078683 counting only the distinct ones).

The product of its (nonzero) digits is 15676416, while the sum is 62.

The spelling of 21919408917434 in words is "twenty-one trillion, nine hundred nineteen billion, four hundred eight million, nine hundred seventeen thousand, four hundred thirty-four".