21154662042101 has 16 divisors (see below), whose sum is σ = 24957518143488. Its totient is φ = 17547036922800.

The previous prime is 21154662042089. The next prime is 21154662042113. The reversal of 21154662042101 is 10124026645112.

It is an interprime number because it is at equal distance from previous prime (21154662042089) and next prime (21154662042113).

It is not a de Polignac number, because 21154662042101 - 2¹⁰ = 21154662041077 is a prime.

It is a super-2 number, since 2×21154662042101² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21154662042301) 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, 4629506 + ... + 7983836.

It is an arithmetic number, because the mean of its divisors is an integer number (1559844883968).

Almost surely, 2^{21154662042101} is an apocalyptic number.

It is an amenable number.

21154662042101 is a deficient number, since it is larger than the sum of its proper divisors (3802856101387).

21154662042101 is a wasteful number, since it uses less digits than its factorization.

21154662042101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3383432.

The product of its (nonzero) digits is 23040, while the sum is 35.

Adding to 21154662042101 its reverse (10124026645112), we get a palindrome (31278688687213).

The spelling of 21154662042101 in words is "twenty-one trillion, one hundred fifty-four billion, six hundred sixty-two million, forty-two thousand, one hundred one".