2159690421 has 32 divisors (see below), whose sum is σ = 3541701888. Its totient is φ = 1142461440.

The previous prime is 2159690417. The next prime is 2159690431. The reversal of 2159690421 is 1240969512.

It is not a de Polignac number, because 2159690421 - 2² = 2159690417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2159690421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2159690431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27810 + ... + 71363.

It is an arithmetic number, because the mean of its divisors is an integer number (110678184).

Almost surely, 2^2159690421 is an apocalyptic number.

2159690421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2159690421 is a deficient number, since it is larger than the sum of its proper divisors (1382011467).

2159690421 is a wasteful number, since it uses less digits than its factorization.

2159690421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99261.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 2159690421 is about 46472.4694953905. The cubic root of 2159690421 is about 1292.5990547966.

The spelling of 2159690421 in words is "two billion, one hundred fifty-nine million, six hundred ninety thousand, four hundred twenty-one".