21421540051 has 8 divisors (see below), whose sum is σ = 22327245824. Its totient is φ = 20529252360.

The previous prime is 21421540037. The next prime is 21421540069. The reversal of 21421540051 is 15004512412.

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

It is a cyclic number.

It is not a de Polignac number, because 21421540051 - 2²³ = 21413151443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21421539998 and 21421540025.

It is not an unprimeable number, because it can be changed into a prime (21421540451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3351261 + ... + 3357646.

It is an arithmetic number, because the mean of its divisors is an integer number (2790905728).

Almost surely, 2^21421540051 is an apocalyptic number.

21421540051 is a deficient number, since it is larger than the sum of its proper divisors (905705773).

21421540051 is a wasteful number, since it uses less digits than its factorization.

21421540051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6709041.

The product of its (nonzero) digits is 1600, while the sum is 25.

The spelling of 21421540051 in words is "twenty-one billion, four hundred twenty-one million, five hundred forty thousand, fifty-one".