21345429420 has 120 divisors (see below), whose sum is σ = 76527357984. Its totient is φ = 4878952704.

The previous prime is 21345429377. The next prime is 21345429493. The reversal of 21345429420 is 2492454312.

It is a happy number.

21345429420 is a `hidden beast` number, since 2 + 1 + 3 + 4 + 542 + 94 + 20 = 666.

It is a super-4 number, since 4×21345429420⁴ (a number of 42 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 929817 + ... + 952496.

Almost surely, 2^21345429420 is an apocalyptic number.

21345429420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21345429420 is an abundant number, since it is smaller than the sum of its proper divisors (55181928564).

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

21345429420 is a wasteful number, since it uses less digits than its factorization.

21345429420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1882341 (or 1882330 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The spelling of 21345429420 in words is "twenty-one billion, three hundred forty-five million, four hundred twenty-nine thousand, four hundred twenty".