2101421409 has 16 divisors (see below), whose sum is σ = 2848485120. Its totient is φ = 1377792000.

The previous prime is 2101421369. The next prime is 2101421437. The reversal of 2101421409 is 9041241012.

It is not a de Polignac number, because 2101421409 - 2⁷ = 2101421281 is a prime.

2101421409 is a modest number, since divided by 21409 gives 21014 as remainder.

It is not an unprimeable number, because it can be changed into a prime (2101421909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43659 + ... + 78159.

It is an arithmetic number, because the mean of its divisors is an integer number (178030320).

Almost surely, 2^2101421409 is an apocalyptic number.

It is an amenable number.

2101421409 is a deficient number, since it is larger than the sum of its proper divisors (747063711).

2101421409 is a wasteful number, since it uses less digits than its factorization.

2101421409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34840.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 2101421409 is about 45841.2631697688. The cubic root of 2101421409 is about 1280.8680247056.

The spelling of 2101421409 in words is "two billion, one hundred one million, four hundred twenty-one thousand, four hundred nine".