21100015551402 has 12 divisors (see below), whose sum is σ = 45716700361410. Its totient is φ = 7033338517128.

The previous prime is 21100015551401. The next prime is 21100015551403. The reversal of 21100015551402 is 20415551000112.

It is a happy number.

21100015551402 is a `hidden beast` number, since 2 + 1 + 100 + 0 + 1 + 5 + 551 + 4 + 0 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (21100015551401) and next prime (21100015551403).

It can be written as a sum of positive squares in only one way, i.e., 21090881735361 + 9133816041 = 4592481^2 + 95571^2 .

It is a super-2 number, since 2×21100015551402² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21100015551401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 586111543077 + ... + 586111543112.

Almost surely, 2^{21100015551402} is an apocalyptic number.

21100015551402 is an abundant number, since it is smaller than the sum of its proper divisors (24616684810008).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21100015551402 is a wasteful number, since it uses less digits than its factorization.

21100015551402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1172223086197 (or 1172223086194 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

Adding to 21100015551402 its reverse (20415551000112), we get a palindrome (41515566551514).

The spelling of 21100015551402 in words is "twenty-one trillion, one hundred billion, fifteen million, five hundred fifty-one thousand, four hundred two".