21270434421 has 8 divisors (see below), whose sum is σ = 28509064704. Its totient is φ = 14106046880.

The previous prime is 21270434399. The next prime is 21270434441. The reversal of 21270434421 is 12443407212.

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

It is a cyclic number.

It is not a de Polignac number, because 21270434421 - 2⁹ = 21270433909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21270434441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18560016 + ... + 18561161.

It is an arithmetic number, because the mean of its divisors is an integer number (3563633088).

Almost surely, 2^21270434421 is an apocalyptic number.

It is an amenable number.

21270434421 is a deficient number, since it is larger than the sum of its proper divisors (7238630283).

21270434421 is a wasteful number, since it uses less digits than its factorization.

21270434421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37121371.

The product of its (nonzero) digits is 10752, while the sum is 30.

The spelling of 21270434421 in words is "twenty-one billion, two hundred seventy million, four hundred thirty-four thousand, four hundred twenty-one".