21121555467 has 8 divisors (see below), whose sum is σ = 28187610624. Its totient is φ = 14068268648.

The previous prime is 21121555421. The next prime is 21121555493. The reversal of 21121555467 is 76455512112.

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 21121555467 - 2⁸ = 21121555211 is a prime.

It is a super-3 number, since 3×21121555467³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (21121555417) 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, 3188223 + ... + 3194840.

It is an arithmetic number, because the mean of its divisors is an integer number (3523451328).

Almost surely, 2^21121555467 is an apocalyptic number.

21121555467 is a deficient number, since it is larger than the sum of its proper divisors (7066055157).

21121555467 is a wasteful number, since it uses less digits than its factorization.

21121555467 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6384169.

The product of its digits is 84000, while the sum is 39.

The spelling of 21121555467 in words is "twenty-one billion, one hundred twenty-one million, five hundred fifty-five thousand, four hundred sixty-seven".