21121001362354 has 4 divisors (see below), whose sum is σ = 31681502043534. Its totient is φ = 10560500681176.

The previous prime is 21121001362343. The next prime is 21121001362381. The reversal of 21121001362354 is 45326310012112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18198525636729 + 2922475725625 = 4265973^2 + 1709525^2 .

It is a super-3 number, since 3×21121001362354³ (a number of 41 digits) contains 333 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5280250340587 + ... + 5280250340590.

Almost surely, 2^{21121001362354} is an apocalyptic number.

21121001362354 is a deficient number, since it is larger than the sum of its proper divisors (10560500681180).

21121001362354 is a wasteful number, since it uses less digits than its factorization.

21121001362354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10560500681179.

The product of its (nonzero) digits is 8640, while the sum is 31.

Adding to 21121001362354 its reverse (45326310012112), we get a palindrome (66447311374466).

The spelling of 21121001362354 in words is "twenty-one trillion, one hundred twenty-one billion, one million, three hundred sixty-two thousand, three hundred fifty-four".