21421529045 has 16 divisors (see below), whose sum is σ = 29439452160. Its totient is φ = 14658370944.

The previous prime is 21421528981. The next prime is 21421529083. The reversal of 21421529045 is 54092512412.

It is not a de Polignac number, because 21421529045 - 2⁶ = 21421528981 is a prime.

It is a super-2 number, since 2×21421529045² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a junction number, because it is equal to n+sod(n) for n = 21421528996 and 21421529014.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 622112 + ... + 655641.

It is an arithmetic number, because the mean of its divisors is an integer number (1839965760).

Almost surely, 2^21421529045 is an apocalyptic number.

It is an amenable number.

21421529045 is a deficient number, since it is larger than the sum of its proper divisors (8017923115).

21421529045 is a wasteful number, since it uses less digits than its factorization.

21421529045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1278244.

The product of its (nonzero) digits is 28800, while the sum is 35.

The spelling of 21421529045 in words is "twenty-one billion, four hundred twenty-one million, five hundred twenty-nine thousand, forty-five".