21154554141 has 16 divisors (see below), whose sum is σ = 32279155200. Its totient is φ = 12071950128.

The previous prime is 21154554137. The next prime is 21154554173. The reversal of 21154554141 is 14145545112.

It is not a de Polignac number, because 21154554141 - 2² = 21154554137 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21154514141) 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, 666051 + ... + 697088.

It is an arithmetic number, because the mean of its divisors is an integer number (2017447200).

Almost surely, 2^21154554141 is an apocalyptic number.

21154554141 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21154554141 is a deficient number, since it is larger than the sum of its proper divisors (11124601059).

21154554141 is a wasteful number, since it uses less digits than its factorization.

21154554141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1363888.

The product of its digits is 16000, while the sum is 33.

The spelling of 21154554141 in words is "twenty-one billion, one hundred fifty-four million, five hundred fifty-four thousand, one hundred forty-one".