21220022009978 has 8 divisors (see below), whose sum is σ = 34723672380000. Its totient is φ = 9645464549980.

The previous prime is 21220022009959. The next prime is 21220022009987. The reversal of 21220022009978 is 87990022002212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 482273227478 + ... + 482273227521.

It is an arithmetic number, because the mean of its divisors is an integer number (4340459047500).

Almost surely, 2^{21220022009978} is an apocalyptic number.

21220022009978 is a deficient number, since it is larger than the sum of its proper divisors (13503650370022).

21220022009978 is a wasteful number, since it uses less digits than its factorization.

21220022009978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 964546455012.

The product of its (nonzero) digits is 145152, while the sum is 44.

The spelling of 21220022009978 in words is "twenty-one trillion, two hundred twenty billion, twenty-two million, nine thousand, nine hundred seventy-eight".