21154535621061 has 8 divisors (see below), whose sum is σ = 29432397385920. Its totient is φ = 13489848801792.

The previous prime is 21154535620963. The next prime is 21154535621077. The reversal of 21154535621061 is 16012653545112.

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

It is not a de Polignac number, because 21154535621061 - 2¹⁴ = 21154535604677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21154535622061) 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, 153293736316 + ... + 153293736453.

It is an arithmetic number, because the mean of its divisors is an integer number (3679049673240).

Almost surely, 2^{21154535621061} is an apocalyptic number.

It is an amenable number.

21154535621061 is a deficient number, since it is larger than the sum of its proper divisors (8277861764859).

21154535621061 is a wasteful number, since it uses less digits than its factorization.

21154535621061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306587472795.

The product of its (nonzero) digits is 216000, while the sum is 42.

The spelling of 21154535621061 in words is "twenty-one trillion, one hundred fifty-four billion, five hundred thirty-five million, six hundred twenty-one thousand, sixty-one".