21421405170 has 96 divisors (see below), whose sum is σ = 62718948864. Its totient is φ = 5025542400.

The previous prime is 21421405081. The next prime is 21421405183. The reversal of 21421405170 is 7150412412.

21421405170 is a `hidden beast` number, since 2 + 1 + 4 + 2 + 140 + 517 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 318307 + ... + 379686.

It is an arithmetic number, because the mean of its divisors is an integer number (653322384).

Almost surely, 2^21421405170 is an apocalyptic number.

21421405170 is an abundant number, since it is smaller than the sum of its proper divisors (41297543694).

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

21421405170 is a wasteful number, since it uses less digits than its factorization.

21421405170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698048 (or 698045 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

Adding to 21421405170 its reverse (7150412412), we get a palindrome (28571817582).

The spelling of 21421405170 in words is "twenty-one billion, four hundred twenty-one million, four hundred five thousand, one hundred seventy".