1621996421195 has 8 divisors (see below), whose sum is σ = 1946403827280. Its totient is φ = 1297591722400.

The previous prime is 1621996421173. The next prime is 1621996421209. The reversal of 1621996421195 is 5911246991261.

It is a happy number.

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

It is not a de Polignac number, because 1621996421195 - 2⁶ = 1621996421131 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1621996421195.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1034720 + ... + 2077170.

It is an arithmetic number, because the mean of its divisors is an integer number (243300478410).

Almost surely, 2^{1621996421195} is an apocalyptic number.

1621996421195 is a deficient number, since it is larger than the sum of its proper divisors (324407406085).

1621996421195 is a wasteful number, since it uses less digits than its factorization.

1621996421195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1353645.

The product of its digits is 2099520, while the sum is 56.

The spelling of 1621996421195 in words is "one trillion, six hundred twenty-one billion, nine hundred ninety-six million, four hundred twenty-one thousand, one hundred ninety-five".