19927021401 has 48 divisors (see below), whose sum is σ = 34176504960. Its totient is φ = 10946799360.

The previous prime is 19927021369. The next prime is 19927021403. The reversal of 19927021401 is 10412072991.

It is not a de Polignac number, because 19927021401 - 2⁵ = 19927021369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19927021403) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 402286 + ... + 449096.

It is an arithmetic number, because the mean of its divisors is an integer number (712010520).

Almost surely, 2^19927021401 is an apocalyptic number.

It is an amenable number.

19927021401 is a deficient number, since it is larger than the sum of its proper divisors (14249483559).

19927021401 is a wasteful number, since it uses less digits than its factorization.

19927021401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47086 (or 47083 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The spelling of 19927021401 in words is "nineteen billion, nine hundred twenty-seven million, twenty-one thousand, four hundred one".